Children should start brushing on their own around 7
Once your child is around 7 years old, they should be able to start brushing and flossing on their own. But just because they're ready, you should still monitor them to make sure that they're doing a good job. Make sure that you are looking for any food and plaque that your child could have neglected, especially along their gums. You can also let them chew sugarless gum to keep their smile fresh and clean.