Not a lot of people realise that the lidocaine you get at the dentists also contains epinephrine to make it last long. Which can play merry hell with your blood pressure. I can’t have epinephrine for other medical reasons besides the way it messes with your blood pressure and honestly I prefer it, I’m numb long enough to do the surgery and it’s all gone in half an hour or so instead of a numb face for half the day.