The #1 selling orthodontic bottle just got better! The NUK Advanced Orthodontic Bottle is the latest breakthrough in orthodontic bottles, with an advanced NUK orthodontic nipple and glass-like, shatter-proof design. The NUK Advanced Orthodontic Nipple supports healthy oral development and features Soft Zone technology for greater comfort. The natural shaped nipple mimic's Mom's to support combining breast and bottle feeding. This unique nipple also has the drinking hole specially located on the top side, not the tip like round nipples, which allows the milk to mix more effectively with saliva and promotes easier digestion. Every bottle nipple includes the advanced NUK Anti-Colic Air System which helps reduce colic.