Can I get a loan from the bank to cover dental work?

Yes, you can. Some dental offices will actually recommend you some banks that have great options for people. It can be a bit tricky if you don't know who to ask or where to go so it is best to work with a dental office.

I have done this in the past since I don't have dental. My loan was on the smaller side ($700) but still, I was able to do it. It just sucked because after the interest I ended up paying nearly double ($1250).

Yes, you can. I know plenty who have. Sometimes the interest rates are much higher. Some personal loans that are outlined to be specifically for medical purposes may have slightly lower interest rates.

As mentioned, you can but I would advise you going to the right kind of bank for such a personal loan. Some dental offices will direct you to specific banks but they are not always good ones.

More and more dental offices are accepting them, yes. You can likely find a bank in your area that will give you one. Some medical insurance doesn't include dental so personal loans for such things are widely available.