The periodontal ligament is a layer of fibrous tissue arranged in groups of collagen fibres which support the root of a tooth by attaching the cementum to the alveolar bone. The fibres are mixed with blood vessels and nerves.

Periodontal ligament within a tooth

The fibres within the ligament can release and re-attach to the root to allow the tooth to move when it erupts, or to be repositioned when it is being moved by an orthodontic appliance.


  1. Naudin C., Grumbach N., Larousse Médical, 3ième édition, Paris, 2003.
  2. Marcovitch H., Black’s Medical Dictionary, 41st edition, London, 2005.
  3. Leikin J. B., Lipsky M. S., Complete Medical Encyclopedia, First edition, New York, 2003.
  4. Wikipedia, the free encyclopedia (

The information above should be used as a reference only. Any medical decision should not be taken before consulting a health care professional.

The masculine gender may have been more used in the article, but without prejudice, to make reading easier.

Category: dental anatomy