Depends. The answer really depends on what kind of dental work you need, and how well-controlled your epilepsy is. With well-controlled epilepsy, a procedure normally done under local anesthesia at the dentist's office can still be performed there. Local anesthesia should not interact with your epilepsy, unless the anesthetic is injected mistakenly into a blood vessel. A careful dentist can reduce the risk.
A Dentist. If the dentist is aware of your condition, it generally shouldn't be a reason not to have work done. Although most local anesthetics can cause seizures in very high doses, the minute amount required for dental anesthesia shouldn't be a problem.