Hyperdontia is the condition of having supernumerary teeth, or teeth that appear in addition to the regular number of teeth. They can appear in any area of the dental arch and can affect any dental organ. The opposite of this condition is hypodontia, where there is a congenital lack of teeth. This is seen more commonly than hyperdontia. The scientific definition of hyperdontia is "any tooth or odontogenic structure that is formed from tooth germ in excess of usual number for any given region of the dental arch” They can be a lot of teeth or not many teeth and can occur on any place in the dental arch. They may be symmetrical or non-symmetrical.