Braces: My orthodontist keeps changing my appointments.

What should I do? My orthodontist keeps changing my appointment, When it comes close to the time my appointment my orthodontist keeps changing it, I haven't had my braces worked on for 3 months this is ridiculous, this is starting to interfere with my work I have to get ahead time notice in order to keep my appointments with my orthodontist, but they keep cancelling it and giving me late notice for the next appointment nothing's being done should I go to another orthodontist? Please what should I do?

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