Human Teeth

Here are the types of adult and baby teeth, and the numbers or letters dentists use to refer to them. A chart of when these teeth erupt is shown below.

Tooth Eruption Chart Tooth Primary Permanent Upper Teeth Central Incisor 8-12 months 7-8 years Lateral Incisor 9-13 months 8-9 years Canine 16-22 months 11-12 years 1st Premolar  - 10-11 years 2nd Premolar  - 10-12 years 1st Molar 13-19 months 6-7 years 2nd Molar 25-33 months 12-13 years Wisdom Tooth  - 17-21 years Lower Teeth Central Incisor 6-10 months 6-7 years Lateral Incisor 10-16 months 7-8 years Canine 17-23 months 9-10 years 1st Premolar  - 10-12 years 2nd Premolar  - 11-12 years 1st Molar 14-18 months 6-7 years 2nd Molar 23-31 months 11-13 years Wisdom Tooth  - 17-21 years

What Teeth are Made of: The hard material of the tooth is composed of calcium, phosphorus, and other mineral salts. The material in the majority of the tooth is called dentine. The hard, shiny layer that you brush is called the enamel.