Fluoride toothpaste. New adult teeth are not as strong as you think. Enamel on new adult teeth is softer and more vulnerable to decay and the mix of little and big teeth makes them more difficult to clean. As your child gets older, their diet may change to include more sugars from food, drinks and sweets that are then converted by plaque into acid, the key cause of cavities. Aquafresh My Big Teeth toothpaste is a foaming toothpaste specially designed for children aged 6+. With active fluoride minerals for Sugar Acid Protection, it helps strengthen enamel to create a shied that protects against sugar acid attack. Gently cleans with brushing. Strong teeth, healthy gums, fresh breath.