Last updated at 09/06/2026 19:27:58
Philips Sonicare DiamondClean 9400 Electric Toothbrush with App HX9917/89, Networked Cleaning, Pressure Sensor, Intelligent Brush Head Detection, 4
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originally posted on philips.co.uk
This toothbrush comes with some great features. It's lightweight, and nice to handle. It looks very modern, and clean. When activating the toothbrush, it automatically links to the app on your smartphone which starts with a 2 minute timer, allowing you to ensure you spend the correct time brushing.It vibrates and shows on the app if there is too much motion, and if you are using too much pressure. This model had come with a outer travel case, which you can also use to charge the brush- it works brilliantly. There are two heads in the box also.There are four settings on the brush, which you can cycle through easilly with the button on the brush and there is a distinct difference which each one. The app itself works very well, and gives you endless tips on how to ... MoreThis toothbrush comes with some great features. It's lightweight, and nice to handle. It looks very modern, and clean. When activating the toothbrush, it automatically links to the app on your smartphone which starts with a 2 minute timer, allowing you to ensure you spend the correct time brushing.It vibrates and shows on the app if there is too much motion, and if you are using too much pressure. This model had come with a outer travel case, which you can also use to charge the brush- it works brilliantly. There are two heads in the box also.There are four settings on the brush, which you can cycle through easilly with the button on the brush and there is a distinct difference which each one. The app itself works very well, and gives you endless tips on how to brush correctly. The one small criticism I would give, is that sometimes the connection between the brush and the phone doesn't always pick up where you are brushing, which in turn doesn't then show on the diagram on the app. This is not a regular thing however.Overall, a great toothbrush and would recommend.
originally posted on philips.co.uk
I received the product soon after being chosen for review.The packaging itself was sleek and impressive when opening the box everything was well presented but there was not too much packaging or anything complicated.The toothbrush carry case is handy and comes with a charging cable inbuilt which was brilliant as i went on holiday and used it to charge up while there.The glass cup charger is sturdy and robust and doesn’t take long to charge up !I downloaded the app which has clear instructions or what to do and handy hints and tipsI set up the toothbrush and opened the app to use while brushing. I was amazed at the technology of how it picks up where you are in your mouth , how it changed tempo to tell you to move sections. I spent more time than I ever ... MoreI received the product soon after being chosen for review.The packaging itself was sleek and impressive when opening the box everything was well presented but there was not too much packaging or anything complicated.The toothbrush carry case is handy and comes with a charging cable inbuilt which was brilliant as i went on holiday and used it to charge up while there.The glass cup charger is sturdy and robust and doesn’t take long to charge up !I downloaded the app which has clear instructions or what to do and handy hints and tipsI set up the toothbrush and opened the app to use while brushing. I was amazed at the technology of how it picks up where you are in your mouth , how it changed tempo to tell you to move sections. I spent more time than I ever have on each section of my teeth , rather than 2 minutes concentrating probably more on the front which this made me realise.It lights up to tell you to stop scrubbing which with the amount of power behind the brush is definitely not neededMy teeth have never felt so clean !!Iv got Invisalign braces so my teeth often felt dirty even tho I was brushing numerous times a day between eating.It’s clear to see from my pictures of my teeth that I upload for my dentist app that within a couple of weeks there’s a huge difference !
originally posted on philips.co.uk
This new DiamondClean toothbrush is going to make your teeth whiter, healthier, and amazingly clean. You're not going to find a better brushing experience. I started off by using the slower mode as I dont usually use electronic toothbrushes but this toothbrush has converted me. I love how my teeth are looking and feel. The settings to change how fast you want the brush to rotate is amazing as you can get a thorough clean. The design is so sleek, looks lovely wherever you stand it. You also get an extra brush head which is great. You can charge by popping into the glass cup that connects to the charging base. The cup can also be used for rinsing your mouth so thats also another good idea. It also comes with a travel charger which is an extra perk if your on the go. I ... MoreThis new DiamondClean toothbrush is going to make your teeth whiter, healthier, and amazingly clean. You're not going to find a better brushing experience. I started off by using the slower mode as I dont usually use electronic toothbrushes but this toothbrush has converted me. I love how my teeth are looking and feel. The settings to change how fast you want the brush to rotate is amazing as you can get a thorough clean. The design is so sleek, looks lovely wherever you stand it. You also get an extra brush head which is great. You can charge by popping into the glass cup that connects to the charging base. The cup can also be used for rinsing your mouth so thats also another good idea. It also comes with a travel charger which is an extra perk if your on the go. I have personally loved this brush so much, and the results I'm getting is making me keen to stick with this brand.
| Features | |
| Brush shape | Oval |
| Pressure sensor | Y |
| Detachable head | Y |
| Backlight display | Y |
Philips Sonicare DiamondClean 9400 Electric Toothbrush with App HX9917/89, Networked Cleaning, Pressure Sensor, Intelligent Brush Head Detection, 4
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
This toothbrush comes with some great features. It's lightweight, and nice to handle. It looks very modern, and clean. When activating the toothbrush, it automatically links to the app on your smartphone which starts with a 2 minute timer, allowing you to ensure you spend the correct time brushing.It vibrates and shows on the app if there is too much motion, and if you are using too much pressure. This model had come with a outer travel case, which you can also use to charge the brush- it works brilliantly. There are two heads in the box also.There are four settings on the brush, which you can cycle through easilly with the button on the brush and there is a distinct difference which each one. The app itself works very well, and gives you endless tips on how to ... MoreThis toothbrush comes with some great features. It's lightweight, and nice to handle. It looks very modern, and clean. When activating the toothbrush, it automatically links to the app on your smartphone which starts with a 2 minute timer, allowing you to ensure you spend the correct time brushing.It vibrates and shows on the app if there is too much motion, and if you are using too much pressure. This model had come with a outer travel case, which you can also use to charge the brush- it works brilliantly. There are two heads in the box also.There are four settings on the brush, which you can cycle through easilly with the button on the brush and there is a distinct difference which each one. The app itself works very well, and gives you endless tips on how to brush correctly. The one small criticism I would give, is that sometimes the connection between the brush and the phone doesn't always pick up where you are brushing, which in turn doesn't then show on the diagram on the app. This is not a regular thing however.Overall, a great toothbrush and would recommend.
I received the product soon after being chosen for review.The packaging itself was sleek and impressive when opening the box everything was well presented but there was not too much packaging or anything complicated.The toothbrush carry case is handy and comes with a charging cable inbuilt which was brilliant as i went on holiday and used it to charge up while there.The glass cup charger is sturdy and robust and doesn’t take long to charge up !I downloaded the app which has clear instructions or what to do and handy hints and tipsI set up the toothbrush and opened the app to use while brushing. I was amazed at the technology of how it picks up where you are in your mouth , how it changed tempo to tell you to move sections. I spent more time than I ever ... MoreI received the product soon after being chosen for review.The packaging itself was sleek and impressive when opening the box everything was well presented but there was not too much packaging or anything complicated.The toothbrush carry case is handy and comes with a charging cable inbuilt which was brilliant as i went on holiday and used it to charge up while there.The glass cup charger is sturdy and robust and doesn’t take long to charge up !I downloaded the app which has clear instructions or what to do and handy hints and tipsI set up the toothbrush and opened the app to use while brushing. I was amazed at the technology of how it picks up where you are in your mouth , how it changed tempo to tell you to move sections. I spent more time than I ever have on each section of my teeth , rather than 2 minutes concentrating probably more on the front which this made me realise.It lights up to tell you to stop scrubbing which with the amount of power behind the brush is definitely not neededMy teeth have never felt so clean !!Iv got Invisalign braces so my teeth often felt dirty even tho I was brushing numerous times a day between eating.It’s clear to see from my pictures of my teeth that I upload for my dentist app that within a couple of weeks there’s a huge difference !
This new DiamondClean toothbrush is going to make your teeth whiter, healthier, and amazingly clean. You're not going to find a better brushing experience. I started off by using the slower mode as I dont usually use electronic toothbrushes but this toothbrush has converted me. I love how my teeth are looking and feel. The settings to change how fast you want the brush to rotate is amazing as you can get a thorough clean. The design is so sleek, looks lovely wherever you stand it. You also get an extra brush head which is great. You can charge by popping into the glass cup that connects to the charging base. The cup can also be used for rinsing your mouth so thats also another good idea. It also comes with a travel charger which is an extra perk if your on the go. I ... MoreThis new DiamondClean toothbrush is going to make your teeth whiter, healthier, and amazingly clean. You're not going to find a better brushing experience. I started off by using the slower mode as I dont usually use electronic toothbrushes but this toothbrush has converted me. I love how my teeth are looking and feel. The settings to change how fast you want the brush to rotate is amazing as you can get a thorough clean. The design is so sleek, looks lovely wherever you stand it. You also get an extra brush head which is great. You can charge by popping into the glass cup that connects to the charging base. The cup can also be used for rinsing your mouth so thats also another good idea. It also comes with a travel charger which is an extra perk if your on the go. I have personally loved this brush so much, and the results I'm getting is making me keen to stick with this brand.
Upon receiving the toothbrush I thought it came nicely packaged and was straightforward to set up. I downloaded the app and it connected to the toothbrush straight away.There are 4 programs; Clean, White+, Gum Health, and Deep Clean+. You simply press the button to switch between these and there is also 3 levels of intensity to select from by pressing the button. There are many heads to go with this toothbrush and very cleverly the toothbrush can detect what toothbrush has been attached and it will automatically select the program best suited for this head.The toothbrush is powerful! Not so much so that it’s uncomfortable but on the highest intensity level the vibration can be quite well I guess….intense.After the first use of the toothbrush I was absolutely ... MoreUpon receiving the toothbrush I thought it came nicely packaged and was straightforward to set up. I downloaded the app and it connected to the toothbrush straight away.There are 4 programs; Clean, White+, Gum Health, and Deep Clean+. You simply press the button to switch between these and there is also 3 levels of intensity to select from by pressing the button. There are many heads to go with this toothbrush and very cleverly the toothbrush can detect what toothbrush has been attached and it will automatically select the program best suited for this head.The toothbrush is powerful! Not so much so that it’s uncomfortable but on the highest intensity level the vibration can be quite well I guess….intense.After the first use of the toothbrush I was absolutely amazed at the difference it made at cleaning my teeth. I always thought that I did a pretty good job of cleaning my teeth and always felt quite happy afterwards but this was something else! My teeth have never felt so clean and I’m sure they look whiter.I brush my teeth using the app so I can see the areas where I need to concentrate on. Sometimes it’s not always easy to get the right angle for the app to pick up the toothbrush but maybe with a bit more practice it’ll get easier in time.The toothbrush has a pressure sensor that alerts you if you press too hard and the app will tell you if you’re ‘scrubbing’ your teeth.The battery life is good and after days off being off charge it still held its charge well. It charges in a nice stylish glass which it just sits in, no messing about with wires but definitely something to keep out of the way of children. It also comes with a travel case in which you can charge it in too. Very handy for on the move and keeping you toothbrush charged and clean.The status of the battery is located on the base of the toothbrush so you can always see when you need to put it in charge.It also tells you when it is time for a new head.The app is a great feature as it has some good information and helps you keep track of your daily brushings and helps you to clean your teeth in the best way. You don’t have to use the app, the toothbrush works just as well without it but if you like technology/gadgets this is an added bonus.Overall I am so happy with this toothbrush and I wish I had got it sooner. If I could I would buy each of my family member one of these as I truly believe it’ll reduce our visits to the dentist for any treatment. This is a great toothbrush which provides amazing results.
This toothbrush is the new generation. It does everything you never thought imaginable. It has important features such as gum health which Is the first iv known a toothbrush to have but is so important in looking after your teeth as your gums are the main factor in keeping your teeth healthy. I found after a couple of weeks my gums wasn’t as red and inflamed or as sensitive. The deep clean feature left my teeth feeling like I had been to the dentist, it has got in between my teeth feeling fresh and smooth. The teeth whitening setting I saw results in approximately 6-7 days, it removed stubborn tea stains giving a brighter whiter smile without the need of harsh chemicals. I like that this came with a case that could use a UK plug but also a nice looking charging ... MoreThis toothbrush is the new generation. It does everything you never thought imaginable. It has important features such as gum health which Is the first iv known a toothbrush to have but is so important in looking after your teeth as your gums are the main factor in keeping your teeth healthy. I found after a couple of weeks my gums wasn’t as red and inflamed or as sensitive. The deep clean feature left my teeth feeling like I had been to the dentist, it has got in between my teeth feeling fresh and smooth. The teeth whitening setting I saw results in approximately 6-7 days, it removed stubborn tea stains giving a brighter whiter smile without the need of harsh chemicals. I like that this came with a case that could use a UK plug but also a nice looking charging glass that you could take on holiday and use an international plug. That means no matter where I go I can take my tooth brush with me, so every base is covered for my oral health. For now and for layer of any problems arise the toothbrush can adjust to my needs.
The DiamondClean Smart HX9917/88 is an excellent toothbrush it really has exceeded my expectations in every conceivable way. I love that the toothbrush syncs to the app on your phone and you can improve your brushing technique, plus it gives you data and tips on how to improve. Its great you can re-order brush heads etc. directly as well. My oral health has improved significantly since using this toothbrush. I love that it comes with two brush heads and there are four different settings plus you can choose the intensity of the brush or just let it decide automatically as recommended. Before this toothbrush i've only used a manual toothbrush, but this is a million times better, my teeth feel clean ALL day. It took a bit of getting used to as the vibrations in your ... MoreThe DiamondClean Smart HX9917/88 is an excellent toothbrush it really has exceeded my expectations in every conceivable way. I love that the toothbrush syncs to the app on your phone and you can improve your brushing technique, plus it gives you data and tips on how to improve. Its great you can re-order brush heads etc. directly as well. My oral health has improved significantly since using this toothbrush. I love that it comes with two brush heads and there are four different settings plus you can choose the intensity of the brush or just let it decide automatically as recommended. Before this toothbrush i've only used a manual toothbrush, but this is a million times better, my teeth feel clean ALL day. It took a bit of getting used to as the vibrations in your head feels odd, but after a few goes it was second nature. The charging is excellent as you just place the toothbrush in the glass it comes with and put it on top the charger. It takes a while but thats fine. I couldn't go back to a manual toothbrush now, this is just so good!
Good product. Two issues:1. Why is the charger different to other Phillips toothbrushes? They should have the same charger so that members of the same household can simply use one charger. Also it comes in two parts for some unaccountable reason which means that the top bit is always going missing. Very bad design2. The mechanism broke. But the Phillips service was excellent so they redeemed themselves there.
After years of using a manual toothbrush I finally gotto use this Philips sonicare,well what a massive difference! I have been cleaning my teeth wrong the whole time,this toothbrush has many features and. can even tell you when you're brushing too hard. It comes in the box along with a charger,charging glass,spare brush head and travel case,but with one charge the toothbrush lasts for ages without having to charge. It also has an app you can download on your phone that recognises how you brush your teeth. I've found as you're brushing it will go through the modes,from clean to whiten to deep clean,it also has different speeds but I've found the lowest speed is enough. The toothbrush is sleek and isn't too heavy to hold and not bulky,after a couple weeks using it ... MoreAfter years of using a manual toothbrush I finally gotto use this Philips sonicare,well what a massive difference! I have been cleaning my teeth wrong the whole time,this toothbrush has many features and. can even tell you when you're brushing too hard. It comes in the box along with a charger,charging glass,spare brush head and travel case,but with one charge the toothbrush lasts for ages without having to charge. It also has an app you can download on your phone that recognises how you brush your teeth. I've found as you're brushing it will go through the modes,from clean to whiten to deep clean,it also has different speeds but I've found the lowest speed is enough. The toothbrush is sleek and isn't too heavy to hold and not bulky,after a couple weeks using it my teeth definitely feel cleaner almost like I've had them cleaned by a dentist and you can definitely see they are whiter,for someone who drinks alot of tea I needed it. All in all it's a great addition to my daily routine,wish I had used it sooner.
After using a manual toothbrush forever, this is like a breath of fresh air (no pun intended). The charging glass is a great idea and looks much more classy on the side. I did find the fact it only came with a shaver plug a problem as alot of new builds do not have shaver plugs, however this is easily sorted with an adaptor plug, but may be something to be considered in the future. The toothbrush itself looks sleek with smooth lines, I like the coloured light on the bottom that alerts you when you are brushing too hard. The vibration is not too loud and the change of vibration to tell you when to move to another part of your mouth is very helpful. The app is amazing, I love that you only need to turn on the toothbrush for the app to sync up with it and remember your ... MoreAfter using a manual toothbrush forever, this is like a breath of fresh air (no pun intended). The charging glass is a great idea and looks much more classy on the side. I did find the fact it only came with a shaver plug a problem as alot of new builds do not have shaver plugs, however this is easily sorted with an adaptor plug, but may be something to be considered in the future. The toothbrush itself looks sleek with smooth lines, I like the coloured light on the bottom that alerts you when you are brushing too hard. The vibration is not too loud and the change of vibration to tell you when to move to another part of your mouth is very helpful. The app is amazing, I love that you only need to turn on the toothbrush for the app to sync up with it and remember your previous brushing, however I did find the fact that I had to take the phone into the bathroom with me everytime I brushed my teeth a bit of a hassle. Other than that the app was useful to see where I was going wrong when brushing and has made me better at brushing - when I had no idea that I was not reaching all areas of my teeth! The battery life has been fantastic, i habe only had to chathe it once in a weeks worth of use. All in all, a great high tech product, suitable for all, with a great look and a good app to go with it.
The Sonicare electric toothbrush is sooo good! I thought, when opening the box, this was going to be complicated especially with an app. But its simple to get up and running. The app took a while to find the toothbrush but was fine when setup up once. The brush heads give your teeth a brilliant clean. My teeth felt so shiny after after. The fact that it has a timer too makes sure I'm brushing for at least 2 minutes. I love that you can just pop it in the glass it comes with to charge. It also comes with a travel case that charges it too. Forgot to say it comes with 2 brush heads. One soft and one hard. The brush gies through 4 different setting too. Clean, white, gum health and deep ckean. The information that gets picked up on the app is interesting. You can see ... MoreThe Sonicare electric toothbrush is sooo good! I thought, when opening the box, this was going to be complicated especially with an app. But its simple to get up and running. The app took a while to find the toothbrush but was fine when setup up once. The brush heads give your teeth a brilliant clean. My teeth felt so shiny after after. The fact that it has a timer too makes sure I'm brushing for at least 2 minutes. I love that you can just pop it in the glass it comes with to charge. It also comes with a travel case that charges it too. Forgot to say it comes with 2 brush heads. One soft and one hard. The brush gies through 4 different setting too. Clean, white, gum health and deep ckean. The information that gets picked up on the app is interesting. You can see the areas that you sometimes miss and it gives little tips to help.Overall, I would definately recommend this to anyone thinking of getting an electric toothbrush.
| Features | |
| Brush shape | Oval |
| Pressure sensor | Y |
| Detachable head | Y |
| Backlight display | Y |
With the Philips Sonicare DiamondClean Smart 9400 HX9917/88, you're sure of good oral hygiene. You can choose from 4 different brushing modes, like the mode for whiter teeth or for sensitive teeth. You can also choose from 3 intensities, so you adjust the brushing movements to your teeth. Not sure what to choose? Thanks to the microchip in the brush attachment, the toothbrush can also choose the best settings for you. The accompanying smartphone app will coach you when you brush. This way, you see when you skip a spot, or if you press too hard, or if you need to brush some problem areas better. You'll also see when you need to replace your brush attachments. It's possible to charge the toothbrush in the travel pouch or with the charging glass.
With the Philips Sonicare DiamondClean Smart 9400 HX9917/88, you're sure of good oral hygiene. You can choose from 4 different brushing modes, like the mode for whiter teeth or for sensitive teeth. You can also choose from 3 intensities, so you adjust the brushing movements to your teeth. Not sure what to choose? Thanks to the microchip in the brush attachment, the toothbrush can also choose the best settings for you. The accompanying smartphone app will coach you when you brush. This way, you see when you skip a spot, or if you press too hard, or if you need to brush some problem areas better. You'll also see when you need to replace your brush attachments. It's possible to charge the toothbrush in the travel pouch or with the charging glass.
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The lowest price for Philips HX9917/89 Sonic Electric Toothbrush with App right now is $266.26 at Amazon.com.au.
The all-time low was $254.40 on 7 July 2025 — today's price is 5% above the lowest ever. This is at or near its all-time low — a good time to buy.
Prices last updated 9 June 2026.
Philips HX9917/89 Sonic Electric Toothbrush with App
With the Philips Sonicare DiamondClean Smart 9400 HX9917/88, you're sure of good oral hygiene. You can choose from 4 different brushing modes, like the mode for whiter teeth or for sensitive teeth. You can also choose from 3 intensities, so you adjust the brushing movements to your teeth. Not sure what to choose? Thanks to the microchip in the brush attachment, the toothbrush can also choose the best settings for you. The accompanying smartphone app will coach you when you brush. This way, you see when you skip a spot, or if you press too hard, or if you need to brush some problem areas better. You'll also see when you need to replace your brush attachments. It's possible to charge the toothbrush in the travel pouch or with the charging glass.
With the Philips Sonicare DiamondClean Smart 9400 HX9917/88, you're sure of good oral hygiene. You can choose from 4 different brushing modes, like the mode for whiter teeth or for sensitive teeth. You can also choose from 3 intensities, so you adjust the brushing movements to your teeth. Not sure what to choose? Thanks to the microchip in the brush attachment, the toothbrush can also choose the best settings for you. The accompanying smartphone app will coach you when you brush. This way, you see when you skip a spot, or if you press too hard, or if you need to brush some problem areas better. You'll also see when you need to replace your brush attachments. It's possible to charge the toothbrush in the travel pouch or with the charging glass.
