Clear Soother Size 1 The transparent design of the Clear soother means it looks unobtrusive when in your baby's mouth. It's also a great choice for expectant mums who don't know the sex of their babies! Because of the neutral design, the Clear soother also goes with any outfit! NUK's unique orthodontic shape is approved by the British Dental Health Foundation, as it helps to exercise your baby's lips, tongue & jaw muscles, encouraging healthy oral development. The NUK Air System helps to ensure the mouthpiece remains soft & flexible. Soother has integrated circulation grooves so air can circulate avoiding skin irritations on baby's sensitive mouth area.