The asymmetrical shape featured on all NUK Soothers is designed to adapt to baby’s mouth perfectly allowing an optimal interplay between the lips, palate, jaw and tongue. Nurturing these muscles will assist in the healthy oral development later in life including trouble-free breathing, problem-free feeding and, later, speech development. Nuk Silicone Soothers are made from a high-quality, synthetic material. The clear, silicone material is easy to clean and particularly heat-resistant. It can be boiled, is free from harmful substances, odourless, transparent and has a smooth surface – all qualities that are important in a soother.