If the pain continues, I suggest you go to SGH A&E, they
have a dentist on 24 hr standby, depending on the crowd, the wait
may be long. But it's the only alternative if you need to
deal with the insanity.
If you can wait, then go to the dentist. Either way, you
can use your medisave if you have it for wisdom tooth extraction
since it usually requires sugery.
For private dentist you need to pay in cash and claim the refund
from your medisave. Hospital and National Dental I think can
use medisave on the spot.
Hope things are ok for you.