I've been saying that for at least 10 years. Even Tijuana is a no-go zone for this gringo. I used to slip into Algadones (near Yuma) for dental work once in a while due to the 1/3 price there but I'm reluctant to even go there anymore. It's just not worth the risk plus if you catch it during snowbird season it a 2 hour wait to walk back across.
A couple of years ago there was a story here of somebody from Texas who disappeared in Mexico while on a dental trip