1. Death (both during and after the procedure)
A doctor would not want to risk going through a medical procedure if there is a risk of death due to some kind of physical ailment. I totally get the fear of dieing though - I had no clue how I would get through the dentist telling me everything that was wrong with my mouth, but if you can, bring a loved one to help you through it. My husband came with me for my first check up and evaluation and the dentist had no issues with him being there with me. Be honest with the dentist about your fears, so that they are aware of what you can and cannot mentally, emotionally, and physically handle and understand that 99% of dentists want you to be happy and safe. I try to be the best patient ever and will work through my anxiety as best as I can, but my dentists realize that I need a gentle touch, time outs sometimes, etc to help me.
2. choking on gauze
Do you happen to know where in your mouth you're sensitive to choking? Mine is in the back of my mouth and it's pretty bad on the right side. I've shared that with my dentist - "hey head's up, I have a choking sensitivity on the right side of my mouth." So they try to take it easy on that side and if something has to go in, it's in and out quickly.
3. choking on blood
Same as above - say something if you have a sensitivity. At least with a liquid, they have tools to get that sucked up right away. When I've had treatments that leads to bleeding, the assistant dentist has always been really great at getting that out of my mouth as soon as possible.
4. vomiting after the procedure (I have a terrible time with ALL pain meds. I have had 2 babies with no meds.)
If you know that medications cause stomach issues, take a small amount of the meds and work up until you find what you can handle. Otherwise, discuss how else you can deal with the pain - ice packs, eating cold food, etc.
5. dry socket
6. post-op infection
Know what to look for and if something is going on, call your dentist about it. As long as you are keeping your mouth clean based on what the dentist has told you, you cannot avoid whether or not you get an infection. It sucks, but that's how it works. A lot of the time people are totally fine, but sometimes infections do happen. If it happens, get help right away.
I have gum disease - I know how I'm supposed to treat it at home and I go to my 3 month cleanings to have my dentist take care of my teeth. I know though that my mouth can get worse, but I'm not going to stress myself out about it and beat myself up over something I honestly DO NOT have control over. If it happens, I will seek out my dentist's advice and keep working on doing what I can.
I have had some difficult treatments - like gum flap surgery - and while not pleasant, I don't have any fears about the treatment. I did it, "survived", and I can move along. If I need to do it again, at least I know what to expect now.