Care: prior to first use, sanitize by boiling in water for 5 minutes. For day to day cleaning, wash with hot water and mild detergent then rinse clean. Dishwasher safe (top rack). The NUK Air System may allow water to get inside the nipple during cleaning. Simply squeeze the nipple to press out any water that is inside. For hygiene and safety replace the pacifier after about 2 months of use.