Hi: Check out "When CCSVI fails try AO and/or Dentist." Rosegirl entry for 3/29/2013 7:43. on CCSVI thread.
Some dentists are aware of structural issues (TMJ ? for instance) but I wouldn't count on it. Probably your dentist wants to be sure Meds you take don't create a problem with local anasthesia or whatever she uses. I can't give an opinion on what to say. I usually avoid saying anything, I don't take Meds for MS and almost all Drs have a fixed "auto-immune" theory for MS I don't agree with. If you are on medication when the dentist treats you, perhaps you need to tell her. Maybe you should ask the Dr who prescribed the Meds if it's OK to be treated by a dentist, or if there are any precautions to take.