Only ones that I ever have had done. It went great.
1) To stop the bleeding, take along a soggy tea bag. Plain and black and laden with caffiene. Slip it into your mouth and discretely give it a gentle "gumming". It was almost instant! The high tannic acid content is a superb coagulant.
2) Try hypnosis. Either standard or self-. Using it to deal with dental work is as easy as it comes. If you have major work ahead, find a local psychologist to help you, but 90% of the time you are all you need. Start about two weeks ahead of time and don't even mention teeth. You will be teaching yourself to enter a hypnotic state. Your teeth are just one of hundreds things that branch off that primary tool kit. And most people can be hypnotized.
Here's how. Using your computer and a microphone and a recording app such as "Audacity' (freeware, search for it), you record three short segments. A) an induction, B) a suggestion, and C) a command. Each of the three is simple and you are not trying to be Svengali.
The induction is the longer and should be written like a school paper. It should be five to seven minutes long, repetitious, and boring. You should have three to five statements like "Your body feels very, very heavy." or "Just listen to my voice and ignore all other sounds." and "Heavier and heavier. Calmer and calmer." and "Breathing slowly and eaily." and so on. The idea is to bore yourself into an alterred state.
Don't mention specifics like your current problem. This induction module is a part of you toolkit and you are going to keep it in a safe place. When you need it, you will make a copy and use that.
You are recording into your computer in your own voice. This can be important if you are someone who has trust issues. When your subconscious realizes that it is hearing itself speaking, two things happen- we trust ourselves and avoid the reluctance that be such a problem, and since we can reuse the longest of or segments, the next time we need a custom hypno tool it is aleady 75% done!
This part, "the suggestion". is the part that relates specifically to the "hear and now". Some phrasing in a boring monotone such as "Dental work holds no problems for me. Things will go smoothly and successfully and my goals will be achieved. Time will pass surprisingly quickly and will seemingly be over with as soon as it gets started."
Copy and paste that short phrasing three time into your project. Not one. Not five. Three. (There is a reason but dinner calls.)
Finally, the third phrasing, like the first, is reusable and worth a bit more care. Something similar to: "Now as I count from one to ten, you will feel yourself beginning to drift back to normal consciousness. At ten you will be alert and feeling stronger. You can repeatedly count from one to ten, growing stronger each time and you will awaken strong, relaxed, and free of stress."
Now that is, admittedly a lap dash lesson, but give it a try. Keep to simple behavior adjustment and don't let you ego get into it. Hypnosis is a marvelous tool and, like a hammer you have to try hard to hurt yourself. If you do have deeper issues find yourself a good psychologist to guide you. I hear that there are a few good ones around here.