Rare Teeth Disorders Everyone Should Know



Dentist Explains Rare Teeth Disorders Everyone Should Know

There are many rare disorders of teeth that many people do not know about. Some of them are anodontia, hyperdontia, and geminated teeth. The OnlyMyHealth editorial team spoke to Dr Kishkindha, BDS, Ludhiana, Punjabto know more about these and other teeth disorders.


Anodontia, also known as hypodontia, is a genetic disorder affecting the teeth. This is a rare disorder in which few or no teeth are formed. Dr Kishkindha said, “In this, the tooth germ is not developed. It is due to this reason teeth are not able to form. It is a developmental anomaly in the tooth bud or germ layer.


“Hyperdontia is also known as supernumerary teeth, which is the increase in the number of teeth from the normal count of 32. This condition also has many types,” added Dr Kishkindha.

  • Ectopic tooth: The tooth is present where it should not have developed, like the nostril.
  • Para molar: Presence of extra molar tooth at the back or front of the actual molar tooth.
  • Distomolar: Presence of extra molar teeth distally to the actual molar teeth.
  • Mesiodens: An extra tooth present between two central incisors.

Supernumerary teeth are associated with Gardner’s syndrome. Usually, there is one additional tooth. Extra teeth frequently do not truly erupt; instead grow in the gum, delaying the eruption of other teeth and resulting in crowding and uneven eruption. Typically, your dentist will advise pulling these teeth or going for orthodontic treatment.

Geminated Teeth

When two teeth emerge from a single bud, the result is an abnormally large or large tooth with two pulp chambers but only one root. This condition is known as tooth gemination. This may result in an improper bite, tooth decay around the joint of the two chambers, or overcrowding of the mouth.

Talon Cusps

According to Dr Kishkindha, “Cusps are present only in the posterior teeth for better chewing. The cusps are not present in the anterior teeth. Talon cusp is a condition in which cusps are also developed in the anterior teeth.” This can lead to various oral health issues, such as malocclusion, gum sensitivity, plaque buildup, and more. Grinding is one option to get rid of them, but if they involve pulp, there is a need for a root canal.


Normally, the anatomy of the root and the crown of the teeth is such that they look equal, but in taurodontism, the crown will appear larger in size as compared to the root. As a result, the teeth seem to look bigger in appearance.

Also Read: Tooth Root Resorption: Signs Of Damaged Teeth Roots You Should Never Ignore

Dens Invaginatus & Evaginatus

Dr Kishkindha notes, “When we take the X-ray of the tooth, we see that there is calcified mass or tooth-like structure in the tooth. This is also known as a pregnant tooth, which can only be seen radiographically.” In dens evaginatus, unlike dens invaginatus, the calcified material or mass grows on the outside of the tooth.

Amelogenesis Imperfecta

In this type of rare tooth disorder, there is some kind of abnormality in the enamel formation. For example, the enamel is not properly calcified or matured, so white patches appear on the teeth.

Dentinogenesis Imperfecta

This is another tooth developmental disorder in which the dentine formation of the tooth is not proper. The normal color of dentine is yellowish, but due to dentinogenesis imperfecta the tooth looks brownish-amber in colour.