You might want to check whether your teeth can be straightened in a year or less.
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I would suggest, stick to dental hospitals and big clinics, some general and specialist hospitals have special packages for foreigners, e.g. Manipal, applolo, Sagar etc,. in Bangalore can quote you on net/email. Hospitals can also thus arrange your stay and would be convenient to you.
Let me know if you need any help in Bangalore
Pro tip