I'm very wary of Botox and in fact any cosmetic procedure unless it is really necessary. I don't think it's right for a dentist to offer Botox at all. S/he is a dentist for heaven's sake!
Many years ago I went to a doctor for a smear test and he noticed I had a large mole over my eye and offered to remove it not because it was dangerous but because I would 'look better'. I told him where to get off and left!
When we went to have our holiday jabs, the clinic was offering Botox too. I picked up a leaflet but the nurse type person said it wouldn't be appropriate for me. I think it would take too much filling to pad out my wrinkles!
Oranges don't move around and suddenly bite you. I note we haven't heard from JaneA Judging by her youthful appearance I suspect she self treats with Botox! ( ducks behind parapet)
Sounds like good business practice: dentist has less time to fix your teeth because he/she is busy doing wrinkle treatments, you grimace more if you are in pain and that causes wrinkles and tension lines that the dentist can fix for you!