Im doing a project on genetics( Any Dentists out there). what is the letter of the alles for extra incisors?

ok so im doing a project on genetics and im doing a pedigree about my family and how we have a history of extra teeth. I am trying to find out the allele letter for extra teeth. and if it has to be more specific any teeth will be fine, anything anyone knows would be really helpful but if you know what it is maybe for incisor extra teeth that would be even better.