Indeed, dental care is about 60% less in Mexico than what it is in the USA.
There are great dentists here in Mexico and probably 6 bad ones who prey on Gringos. Nevertheless, most dentists here are honest and professional.
Three years ago, I came out of retirement and opened a dental clinic here in San Miguel de Allende in order to help my dental charity treat the poor and elderly. I am still amazed that fees are so low. For example, in my practice in the USA, my fee for a porcelain to metal crown was $1,500 USD. Here its around $350.00 USD.
Americans coming to Mexico for treatment get value for money. Most dentists here use the same materials that US dentists use and still the cost is much lower here. I for one use only ADA recommended materials in my clinic.
I know that some Americans coming here for treatment bring their own gloves and needles. Most dentists have up to date equipment and good sterilization so no need to be afraid.
I spend a lot of time in Texas which is the Medicaid capital of the world and it amazes me to see elderly Americans walking around without teeth because they cannot afford high cost of dental treatment. This really breaks my heart. I say that they should all take a 7 day trip to Mexico (and in particularly, San Miguel de Allende, Guanajuato, which was voted the Best City in the World by Conde Nast in 2014) and have their dental treatment taken care of.