This anomaly is large enough to be seen with the naked eye. One can see the projection on the incisal edge of a tooth looking into the mouth of the affected person. The structure is described to be "T'shaped" or "X-shaped" however will differ depending on its shape, size, structure, location and site of origin. X-rays and radiographs can also show evidence of the abnormality. The digital images would show a tooth with<unk>  as if it were "double teeth". When looking at a radiograph some features to look for would be location, edge, shape and number. The location would be on an anterior tooth, the edge would be clear and well defined and can be seen even by the naked eye, and the shape would appear<unk> -like" over the top portion or crown of the affected tooth. There could potentially be one, two or multiple protrusions depending on the type of<unk> .<unk>  can fall under three categories: Type I, Type II and Type III. They are created based on the<unk>  formation shape and length of extension. *Type I -<unk> : The additional<unk>  or<unk>  projects from the palatal surface of a primary or permanent anterior (front) tooth that extends at least half of the distance from the cemento enamel junction to the incisal edge. *Type II - Semi<unk> : The semi<unk>  measures about 1mm or more in length but extends less than half of the distance seen in Type I<unk> . *Type III - Trace<unk> : The projection originates from the cingulum (also known as the "cervical third") of the root and is enlarged or prominent in any form (conical, bifid or tubercle-like) Since many cases of<unk>  go unreported, it is hard to draw linkage maps but it is safe to assume that dental formation is influenced by genetic factors.<unk>  is also seen in association with conditions such as Rubinstein-Taybi syndrome, Mohr syndrome, Ellis–van Creveld syndrome, Incontinentia pigmenti achromians, Berardinelli-Seip syndrome, and Sturge–Weber syndrome.
Talon cusp
Cradle cap
Harrison's groove
Cobb angle
Axon hillock
Cementicle
Apex 
Tycoon's cap