My 5 yr old niece just went to the dentist for the first time. The dentist did x-rays and noticed a pocket of 12-14 extra baby teeth in the roof of her mouth. The extra teeth are not visible or painfull. The dentist did not explain the disorder very well, he admitted he wasn't familliar with this type of disorder at all. My niece is due to have surgery to remove the extra teeth. I just want to know if this is common and what exactly causes it. I could not find any info on the net any where. I am not even sure what it is called.