My children were in braces with Dr. Roska for a number of years. After visiting another dentist (once the braces were removed) there was cement on their teeth from the braces. These new dentists were critical not only of Roska bu the methods he employed.
Additionally, their teeth are moving back to their previous setting, in spite of the 'retainers' they received.
If you're looking for a recommendation, mine is "go elsewhere, this guy is clueless"