NUK Silicone Starlight Soother is a special orthodontic shaped soother, designed to encourage correct oral development. It is: Anatomically shaped to fit baby's face and thereby positioning mouthpiece correctly in baby's mouth. Top of mouthpiece is rounded to comfortably fit baby's palate and to encourage correct oral development. Flat underside ensures correct positioning of tongue encouraging milking action. This helps to widen the jaw, allowing space for tooth development. Flat slender neck allows baby to tightly close lips and mouth, promoting nasal breathing. The NUK Air System allows air in and out of the soother through a vent which helps the teat return to its original orthodontic shape, for a comfortable and correct fit in baby's mouth.