I don't go to a chiropractor because message therapists are far cheaper. If you are having medical issues with your body you should really see a real doctor.
Dentistry is ridiculously expensive imo. Cleanings are between $75 and $100 unless you're going to a hole in the wall place offering a special. They charge $25 just for the fluoride used during the cleaning. If you need your yearly X-rays, add another $150. Need a filling? You're looking at $120 to $240. Need a crown? You're not walking out the door for less than $1500.
Optometry is pocket change compared to your dentist. The real cost is first in the lenses, second in the frames unless of course you're going for designer frames like Coach, Ralph Lauren, Burberry, etc.