Dr. Brown''s - PreVent Orthodontic Pacifiers Unique 0-6m - 2 Pack Dr. Brown''s PreVent Pacifiers are developed by a pediatric dentist. Dr. Brown''s PreVent Pacifiers help minimize the pressures inside baby''s mouth. These pressures can sometimes create dental issues such as cross bites. Palatal pressure is lessened by creating an air channel that reduces suction and spreads apart when baby is sucking. This Patented Suction-Free Air Channel opens up as baby sucks for low pressure comfort. PreVent Health Benefits Patented pacifier design from a pediatric dentist Suction-Free Air Channel helps reduce suction and palatal pressure Soft, suction-release bulb spreads wider as baby sucks for low pressure comfort Helps to lower the pressures inside the mouth that can create dental issues, such as cross bites Thin-stem design is minimally intrusive on babys mouthExpirationThis product has no expiration date or the manufacturer has not provided an expiration date.