The Collis-Curve Toothbrush has three rows of curved bristles to clean tooth surfaces and massage the gums at the same time. The outer, longer bristles are soft and curved to clean the sides of the teeth and gums, while the centre bristles are firm and short to clean the tops of the teeth. Collis-Curve Toothbrush The Collis-Curve brushes the 3 sides of the tooth at once Easier for parents and other carers to manage More comfortable for the child It takes half the time to remove plaque than regular brushes Every study completed has confirmed it's increased efficiency Youth: The Collis Curve Youth for juniors has a small head for easy manipulation in the confined spaces of the young childs mouth. Start using at the appearance of the first molar, usually 5 years old. It is recommended to assist children with brushing until they reach at least that age. For use up until approximately 13 years. Adult: We now also have the adult size brushes with slightly larger handles and brush heads.