Huh. So, I tried that. I have no idea how you do it, but that was a very difficult and unsuccessful task. I tried with a Q-tip but she just bit it in half. Tried using my fingers to massage the side of her mouth but that just made her lick me. Then tried with slightly more effort but she never opened her mouth wide enough. It just stressed us both out. Luckily she didn't hold a grudge and let me pet her until her little eyes shut for a nap.
I'm at a bit of a loss. Since this has been going on for awhile, I am more nervous about the stress of taking her to a vet than whatever is going on with her and it doesn't appear to affect her in any other way...
I am probably biased as well though, because snake owners aren't normally ones to bring theirs to vets - inexperienced and often (I hear) incorrect vets... so I'm skeptical as to why it would be any different for BTS.