Can my narrow arch forms be corrected with Damon braces? As well as overbite, overjet and centre line discrepancy?

I've had traditional braces in the past which I had taken of in 2014, I haven't since worn my plastic retainer. My fault, I know. Which is why I'm seeking treatment again! I have found an ortho who claims he can take my teeth from a C to an A*and correct all issues I've described that he diagnosed in a consultation. I'm trying to get all the advice I can before going ahead with treatment as it's very expensive. I want what he claims he can do. Is it possible? Thanks in advance.