Yeah, that's why getting sufficient protection is necessary, or you'll get exposed to a large amount of mercury vapor in one sitting. Though one amalgam is not as bad as 2 or more, it may still be quite significant once it is drilled. Some seem to get away with it, others do not.

I got far sicker in health after one particular tooth extraction in 2004, which I've had chronic symptoms ever since. Though I had other dental work around that time (replacement of old composite), I believe it may have been the extraction that did it. One doctor keeps detecting dead pulp/gangrene on his EAV machine in the particular area of extraction.

Unfortunately it doesn't show up properly on any other test, so I can't verify it fully. Contradicting reports on whatever it is in the mouth that is chronically affecting my health. Plus, treating cavitations is very difficult too. They can come back, or other things can occur during surgery. Sometimes it is successful, but there is not always a guarantee. Cost also comes into it. But that is possibly next on my agenda at some point. If I can find a dentist or oral surgeon that is willing to open the sites up and clean them out and stitch them back up. I am nervous about proceeding with this in case anything worse happens....

It seems there are many ways dental work can make people very ill and chronically so. It's never risk free. But there are dentists who can certainly reduce the risk by their knowledge and expertise if they understand these risks/problems and can do what they can to do things correctly, thoroughly and give as much protection as possible.