NUK Comfy? Pacifiers feature a one-piece 100% silicone design that gently contours to baby's face. The heart-shaped shield fits perfectly under baby?s nose for easier breathing and to prevent irritation. The unique, breast-like nipple naturally fits baby?s palate and helps promote healthy oral development. Invented over 60 years ago by pediatric dentists and doctors, NUK orthodontic pacifiers are modeled after the natural shape of mom?s nipple while breastfeeding, creating an easy transition from breast to pacifier and back. The NUK� Comfy? pacifier is made of 100% medical-grade silicone, and is BPA-free and dishwasher-safe (top rack only).