something felt out of place in my mouth, so I got some floss to ferret it out. and yes, it really was, out of place. for with the floss, there was a loss, of a nice chunk of tooth.
since i'm an old and decrepit pensioner, mine would be free anyway, although they're not charging much... so maybe they work on the principle that they'll do a 100 $50 patches, instead of 10 $500 ones?