The legal and political hurdles here are worse than the technical ones (at least in the US).

Not as familiar with dentistry for but for "AI doctor", FDA needs to either create new categories or approve AI care under medical device and software as a medical device (SaMD) standards, state medical boards need to relax the licensure grip on scope of care, and CMS needs to create new CPT codes (which are largely dictated by the AMA i.e. lobbying group for physicians) so there's a way to bill insurance for AI-provided care.

Unfortunately we have a much better system for maximizing physician wages than minimizing patient cost of care. Doctor demand is guaranteed by frequently tying legal, reimbursable care to physician labor, and doctor supply is limited by the number of available residency slots. Ironically it makes doctors miserable because they're ridiculously overworked due to the excess demand and constrained supply.

I saw a video recently that said that radiology schools rebounded after preliminary diagnosis went to AI, because it dropped the cost of imaging so much that more imaging was prescribed by primary care doctors, causing the total hours of labor available to radiologists to go up, not down. Spread out over more patients of course.

There are a lot of procedures that are too expensive to do if the likelihood of negative results is high.