I have a question about capping a tooth, does it hurt?

Generally: No more than any regular filling. Talk to your dentist if you have any questions about the procedure.

Usually not: If the tooth involved has major decay and is close to the nerve, I will periodically rough prepare the tooth for a crown and make a temporary crown to wear for a period of time to determine if the tooth also needs nerve treatment. A crown should feel the same in the mout as an untreated healthy tooth

Rarely, but...: Usually no more discomfort than placement of a dental filling with the dentist's use of good anesthetic technique, Unless the tooth was painful prior to the procedure.