For us we put .50 cents into a US turnstile and walk into Mexico - that's it. When you're done you put .35 cents into a Mexican turnstile and proceed directly to US customs to be "allowed" back in.
We've had Passports for the last 20 years and would never not have them. Just makes life so much simpler. They're good for ten years.
On the subject of Dental work I think you get what you put into it. Heard many good things from people who took the effort to get quality recommendations. The problem is it takes time to find people who you can count on to give you good advice. Showing up at a RV park and asking the check-in person might not be so good. Someone who got their teeth cleaned and a filling might not be the best for recommending a dentist to do teeth extraction, and implants. Last thing you want is an infection in your jaw bone.
If things do go wrong what is your recourse? Who do you call? What paper work do you file. Might explain one reason why things are so much cheaper, don't you think.
