Doc Toothache, you continuously crack me up! I go outta my way to read threads I have no interest in whenever I see you responded!
Anyway, in my situation, the LOR from a dentist was not that important. (Although, I am sure many have had much different experiences than I) I ended up having my general dentist write me a letter because the dentist I shadowed was diagnosed with alzheimer's and was unable to do so. The dentist who wrote the letter even admitted that he would have no idea what to write, since I was just a patient of his. I sent him my resume, and although I didn't read the letter, I am sure it was pretty standard...good grades, hard worker, blah blah...Anyway, I had no problems getting accepted the first time around, and didn't even have to address this situation in my interviews...
Don't get me wrong, I don't blame my dentist at all for writing a general LOR. I completely understand, and am just grateful he was willing to do so since my request kind of came out of no where!