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Tooth Eruption - Children's Hygiene

All 20 primary (baby) teeth are already being formed in the jawbones at birth. Generally, the first teeth to erupt are the lower central incisors (front teeth) around age 6 months. By the age of three, all 20 primary teeth are usually completely erupted. All of these teeth will be replaced by permanent teeth beginning around age 6 and continuing until about age 14. The permanent molars will erupt behind the last primary molars, so having to brush further back becomes a new experience for the First-grader.