Great question. The question patients should ask their dentist is "how often should I be seen for cleaning while I have my braces on?" Most adults, regardless if they are going through braces or Invisalign treatment, should be seen every 3 to 4 months. But I prefer if their dentist would tell them that.
The question most often asked towards the end of treatment is "when am I getting my braces off," which is a legitimate question to ask as long as it is not 8 months into a 24 months treatment.
I like all questions through out the treatment. That means they are engaged in their treatment and that keeps I and my staff interested.
The most important question that patients should ask that they do not is, "what can I do to make the treatment to go smoother?"