I'm one of them. I've had crappy teeth since I was young. Much of my young adult life was spent in the dentist chair. I'm surprised I haven't been poisoned from the amount of mercury in my mouth as a result of fillings--every tooth has at least one. A few years ago, my teeth started cracking and falling apart. I couldn't afford to visit the dentist so they have progressively gotten worse over time. I've had 4 yanked so far and some of the others are just gone.
I got quoted $18,000 US to get the implants. That's $17,700 more than I have. Rent and food come before my appearance (which ain't much to begin with).