Lingual braces?

I just had a couple of quesitons regarding my treatment I had with lingual braces. I've had them on for about 2 years however within that two years I have had 17 brackets come off. Ortho wanted me to discontinue trearment. My question is when you lose a bracket is the doctor responsible for ordering a new one so the same ones don't keep falling off. I currently have harmony braces, I would appreciate any input as I'm trying to figure out what to do next for treatment.

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