Actually you need not determine who is best orthodontist. What you should be looking out for, specialization should be be masters degree holder - MDS (Ortho). Should be closeby, where you can reach out to the orthodontist near me, when you need them. She should have enough time to give you. She should use standard branded products.
No, extraction of teeth is not mandotory. A qualified orthodontist after examining can determine if extraction should be done. Dr Ankita believes in avoiding extraction to a large extent and use appliances/TADS other ortho techniques to create space and move the teeth.
For braces treatment it is required to change the archwire, hence is visit is mandatory. Some of the branded braces like Damon, a visit every month may not be required. For aligners, visit every two month is just fine.
Ideal age to get braces is when all the milk teeth have shed. Then braces treatment can be planned. Again a qualified dentist opinion is necessary to take the decision.
Yes adult can get braces.