Kids can typically start brushing their own teeth around age 6, but they should be supervised until about age 8 to 10 to make sure they’re doing it properly. Here's a general guideline:
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Ages 2–3: Kids can start helping with brushing using a small, soft-bristled toothbrush and a pea-sized amount of fluoride toothpaste (with adult help).
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Ages 4–6: They can begin learning to brush more independently, but adults should still help or supervise.
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Ages 6–8: Most kids develop the motor skills to brush on their own, but supervision is still important to ensure thorough cleaning.
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Ages 8–10: At this point, most children can brush effectively on their own.