Preventing tooth decay requires the help of parents to commit to regular dental exams - starting from the eruption of the first tooth. Your dedication to daily oral hygiene by brushing and flossing and feeding your child with proper nutrition is essential in preventing tooth decay. Supervising your child on how he or she is taking care of their teeth is vital to the success of their oral health. Children should be assisted with brushing their teeth until age six and supervised through age 12.