Hyperdontia: Symptoms & Signs

Medically Reviewed on 12/14/2021

Hyperdontia refers to the condition in which one or more extra teeth develop in the mouth. These can be primary or permanent teeth. Having more than 20 primary teeth or 32 permanent teeth is considered to be hyperdontia. The extra teeth can erupt at any location in the dental arch.

Hyperdontia may not produce any symptoms or signs. When signs and symptoms occur, these can include

  • misaligned teeth,
  • difficulty chewing,
  • the appearance of crowded teeth, or
  • toothache.

Causes of Hyperdontia

The cause of hyperdontia is not well understood, but the condition is associated with some hereditary syndromes and conditions including cleft lip or palate, Gardner's syndrome, Ehlers-Danlos syndrome, and Down syndrome.

Other hyperdontia symptoms and signs

  • Appearance of Crowded Teeth
  • Difficulty Chewing
  • Misaligned Teeth
  • Toothache


What causes tooth decay? See Answer

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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.