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Tooth EruptionPrimary teeth begin developing before birth. The first primary tooth erupts into the mouth at around 6 months, usually in the area of the lower front teeth. All 20 primary teeth should be erupted into the mouth by age 3, but their sizes, shapes, and paces always vary from child-to-child. The lower front permanent teeth usually erupt into the mouth around age 6, and the permanent dentition is usually fully erupted by age 13, except for any wisdom teeth (third molars), which can erupt on average until age 21. All of these eruption patterns are averages. Some children will erupt their primary and permanent teeth very early and some will erupt their primary and permanent teeth later. Dr. Gonzales will follow their eruption pattern and recommend the best course of treatment based on your child’s pattern and dentition.