Why Don't We Have Shark Teeth?

Have you ever wondered why sharks have several rows of teeth and we have only one? Neither have I, but scientists have. Genetic researchers have isolated a gene in mice that controls tooth development and placement. When they "turned off" the gene, the mice developed extra teeth.

In humans this could provide a weapon against abnormal teeth development and cleft palate, which occurs in 1 in 700 live births.  Also, the potential to grow new teeth in adults could add an additional choice to dentures or dental implants.

Tonight when you pick up your toothbrush, be happy you don't have mouse or shark teeth. Also, they don't have the ability to call 1-800-DENTIST to find a great dentist.