Infected tooth

We went to Griffin's dentist last Friday, supposedly for fillings on his canine tooth. Unfortunately, the dentist said, there is infection on the tooth so fillings are not possible. He has to either extract the tooth or perform a root canal. However, he wants clearance from Griffin's pedia before doing any action. We went to Griffin's pedia yesterday to ask for clearance but he says he doesn't give clearance unless the procedure is to be done in a hospital. He just prescribed antibiotics. Hopefully, the antibiotics would get rid of the infection.