Our first set of 20 teeth appears between the ages of 6 months and 3 years. These teeth are known as primary, deciduous, or milk teeth. As the jaw grows, a set of 32 secondary (adult or permanent) teeth appears between the ages of 6 and 21. As the secondary teeth erupt, they displace the primary teeth, which usually fall out by the age of 13. In some cases, the third molars, also known as wisdom teeth, never erupt.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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