I once read that if you have to go to a chiropractor more than 3 weeks in a row, you're only aggravating the problem. I believe for scholiosis the best treatment is a back brace. Currently, there's no research that chiropractic has any positive effects on scoliosis other than temporary pain relief. Might as well take aspirin - they're less likely to do serious harm to your body.
I'm all about alternative medicine, but I hold no confidence in chiropractors as a long-term health solution. A good chiropractor will recognize that:
(a) Chiropractic is best suited to heal musculoskeletal ailments - not every illness that ails you, as is part of the fundamental theory behind chiropractic over the last 200 years
(b) Sometimes, conventional medicine is required for certain ailments