Orthodontic pacifier designed to help prevent dental issues like posterior crossbite Designed by a pediatric dentist The glow-in-the-dark shield makes the pacifier easy to locate at night and is easy to recharge - just expose to light Dr. Brown’s PreVent Pacifiers are as adorable as they are effective. Designed by a pediatric dentist, the 100% silicone bulb features a patented suction-free air channel and thin bulb stem that reduce pressure inside baby’s mouth, helping prevent dental issues such as posterior crossbite down the road.