3+ months. Flex patented technology. As soon as your baby starts teething, it is important for you to care for their teeth and gums. Aquafresh Training Toothbrush is designed to help you gently clean your baby's teeth and reduce the risk of damage to gums. Flexible neck bends to absorb excess pressure from brushing, and soft bristles help reduce the risk of damage to baby's gums. Rubber cushioning on the back of the brush head helps protect your gums. Dentist recommend that toothbrushes are changed every three months. www.Aquafresh.com. Made in Germany.