Can Thrush Come and Go with out Treatment?

I've had thrush on and off for 2 years now. Nystatin doesn't work at all. Gentain violet (sp?) Does work but I can't use it ask the time because of the purple staining. I have been checked for HIV and I am negative, so that's not the issue. My dentist says it doesn't look like thrush to her. So I have 2 questions. Can thrush come and go at will with out treatment, and are there any other mouth disorders that are mistaken for thrush? Thanks in advance...

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