It would have very little effect at all, but if you apply some heat and do light exercise, which means wiggle your jaw all around and/or makes faces in the mirror, you might increase blood flow to the area which could help make the numbness go away a little faster.Source(s): Picture Taker · 6 years ago.ow to make a numb mouth from the dentist go away quicker? I got a few fillings in my teeth about an hour and a half ago and my mouth is still numb.