This looks like it was once a “thing,” and then it died... but now it is making it way back to YouTube and other social media sites...
“Rodentist” looks to be videos of people letting their RAT clean their teeth.
The New York Post put this caption on their YouTube Video:
“A rat owner filmed herself getting a thorough teeth-cleaning from her pet rodent. Apparently, this is a thing that some rat owners like to do. The American Dental Association, however, still recommends using a soft-bristle brush twice a day with a fluoride-based toothpaste, as opposed to sticking live animals in your mouth.”
This is one of those examples of, just because a play on words sounds good, doesn't mean we should actually do it.