By Tobias Carroll When you think about going to the dentist’s office, do you find yourself feeling a rush of fear, seemingly from nowhere? The good news — or the bad news — is that you’re far from alone in this. A recent WebMD article cites the statistic that between 9% and 20% of Americans view dental visits with apprehension. Here’s the thing, though — for as unnerving as modern dental technology can be, it used to be so much worse. That’s the biggest takeaway from an excerpt from Paul Craddock’s new book Spare Parts: The Story of Medicine Through the History of Transplant Surgery. The excer…