Two weeks ago, I had a dental filling replaced. The dentist used a laser. The laser itself was great - Peltor muffs made the noise very reasonable. During my earlier visit, the dentist told me that the laser could be used on dental fillings. This was true - he used the laser to remove the old filling. Unfortunately he still needed to use a traditional drill to "polish" the filling, and to ensure that the shape of the filling wouldn't lead to the lower tooth always putting pressure on the tooth with the filling. [I have no idea whether he used a regular air-powered drill, or the electric-powered drill that I asked him to use, but that he told me he won't need to use as he would be using a laser.] It was very loud. It sounded the same with and without Peltor muffs. The dentist, all of a sudden, had a problem with drilling for 5 seconds and taking a 10 second break. I paid him $300 for the extra time, but all of a sudden he said that the drill needs time to get up to speed, and that 5 seconds is not enough time. He didn't want to spend the extra 5 minutes, and seemed to be more than willing to take a risk that my T would be louder for the rest of my life. He would continue drilling, even after I would raise my hand for him to stop(!)
In any case, using a laser cuts down on the time during which you have to bear being exposed to the drill. So if you need to have dental work done that involves drilling, find a dentist who has a laser and a electric-powered drill, and who is not an asshole. Pay upfront for the extra time, and make sure to remind the dentist that you paid for the extra time (there is a chance that my dentist had forgotten that I paid for the extra time).
After that dental work, I had a spike for about a day, and a full ear sensation for about two days... It looks like it hasn't caused any long term damage.