Okay so I am thirteen and I have one baby tooth that has a cavity in it. My adult tooth is there but has not yet came out enough to push the baby tooth out. My mom wants to get it filled because she said the cavity can jump to my healthy adult teeth. However I do not see the point when even the dentist said the tooth should be falling out if not this month then next for sure. Why pay for a filling? I do not think a cavity is going to jump to my adult tooth in less then two months.