Includes 28 Whitestrips (14 treatments) & 1 tube of flavor serum Infused with a burst of charcoal mint Easy to use. Leave on for 30 mins a day Safe & effective Reveal your bright, beautiful smile. Crest 3D White strips charcoal mint dental whitening kit takes your teeth whitening experience to the next level. Get a noticeably whiter smile with a fresh burst of charcoal mint. It's easy to use: Apply two dots of the charcoal mint flavor serum in the middle of your white strips for a better whitening experience. Apply on your teeth for 30 minutes and remove. It's safe and effective. Crest 3D White strips charcoal mint is the #1 home whitening kit recommended by dentists.