One dental condition that not many people know about is hyperdontia, or supernumerary teeth. People with this condition sometimes grow an extra tooth or two. The average person grows 20 primary teeth, or baby teeth, and 32 permanent teeth as they reach adulthood. Most people with this condition will only grow one extra tooth, but there have been cases wherein a person can grow as much as 30 extra teeth. This rare condition is said to affect about 1-4% of the population, and in some cases the patient may not even know that they have it. It is uncertain how this condition actually develops, but a popular theory in dentistry is that a tooth bud splits itself, and thus gives way to extra tooth growth.
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