Hello Oregondaisy.
Previously back when sterilization practices weren’t quite up to the standards that they are today some people who had root canal procedures etc had been known to contract some nasty things from dentist offices that weren’t as hygienic as they could be.
There have been a few health scares in the last couple of years in various dentist offices in the USA and Canada related to Hep B as well if I remember correctly, I don’t think there were any proven cases of transmission by these means recently but it was enough to get the authorities involved and recommend testing for the patients of particular surgeries.
