Thanks for reminding me that I have an appointment on Tuesday!!! I hope you're one of the "nice" dentists who don't enjoy inflicting pain. Photographically speaking, I think the photo could have been better with a coloured background. I really like the placement of the teeth.
This is only the second photo I'm looking at but I strongly suspect it will retain its originality throughout. Despite being very staged I think it's a good idea; it's 'arty' and I'm perfectly fine with the 'dentist office' relation to the topic.
Nice picture, I like the symmetry of the teeth you've placed there. I personally might have tried with softer lighting so the shadow off the drill wasn't so harsh. Good job.