The cusp of carabelli is a non-functioning mini cusp that forms on some upper permanent first molars. It occurs on the side of the tooth facing the inside of the mouth on the mesio-palatal cusp and, if present, can feel like an extra bump on your tooth.
This dental abnormality was first discovered in 1842 by an Austrian dentist named Georg Carabelli and is well-known as a heritable occurrence. This distinct dental trait can be traced back to European ancestry and scientists are exploring its prevalence in Middle Eastern and Asian populations, according to the Notes in Human Evolution.
Because teeth are the hardest, most mineralized substance in the body, biological anthropologists and forensic specialists have long studied this extra cusp. Do you have a cusp of carabelli? The only way to know is to take a look inside your mouth or to ask your dentist!