Flowing, heart-shaped mouth shield with star, heart or bubble-shaped openings for a cute look on your little one; glow-in-the-dark design allows for easy finding at night and during nap time. Improved NUK original shape modelled on a mother’s nipple while breastfeeding for a natural, satisfying feel. 100% of orthodontists confirm that NUK Soothers do not cause crooked teeth or jaw misalignment. NUK Air System allows air to escape so teat remains soft and flexible in baby's mouth. Promotes the healthy development of teeth and jaw by exercising baby's lips, tongue and facial muscles.