Abscessed Tooth(cat)

[Amalfia]

My cat, Dave, has an abscessed tooth and the vet told me that it would have to come out. He is taking medication (penicillin) for the infection at this time. I was wondering if any one else has dealt with this problem. Does the tooth have to come out or will the meds fix it? You see it is dental month at the vet so I don't know if it is a sale they are trying to make or if it is really necessary. Any information would be of help.

Thanks
Amalfia