Re: how long does novocaine last?
I've also wondered this....I had a filling a few months ago and I was completely numb for 4 hours before it even began to thaw! But just this Friday, I had gum surgery and the novacaine had worn off almost by the time I had left the office. I was given much more novacaine for the surgery than I was for the filling and it wore off quicker. Go figure...... I guess I don't know the answer to your question!