You can start brushing your child’s teeth as soon as they start to appear. Use a baby toothbrush with tap water each night after the last feeding. A special low-fluoride toothpaste can be introduced for children at 18 months. By age three, children should be brushing twice a day with fluoride toothpaste, with the help of a parent or caretaker up until age six or seven. At this age, they should be able to properly brush on their own. Your dentist will advise on assisting your child with flossing.