The NUK Genius Soother has an approved orthodontic shape with a soft and flexible baglet to reduce pressure on baby's jaw and teeth as well as reduce the risk of tooth misalignment. Genius soothers are made from soft-flex silicone, which is extremely flexible yet still bite resistant. The NUK Air System also helps to ensure the mouthpiece remains soft and flexible, and the integrated grooves enable saliva to flow away from baby's mouth, avoiding skin irritations to the area. Size 1 is suitable for babies aged 0-6 months. Approved by British Dental Health Association.