@NotMeNotYou: That isn't an option for me either since my financial situation is "I can't afford it unless it's on sale for 100%-off", and I don't even have a way to get to Mexico anyway.

I really need to get a stable job.

@Chameloshi: do you have a medical university nearby that offers courses for dental stuff? You could see if they accept volunteers where you'd be operated on by students under the supervision of an actual professor.
Chances are it's free.