Been there a few times.
Had a post put in for an implant in Feb, will get a crown this fall.
There must be 50+ dentists within two blocks of the border crossing, charging rates less than half of their U.S. competitors. The dentist I will be using practices on both sides of the border and charges less than half as much on the Mexican side, the difference due -- she says -- mainly to the cost of liability insurance. I've seen her excellent work on multiple friends so I have no worries.