Fordyce granules? Like the previous doctor said, it could be a yeast infection known as candidiasis. Do the bumps wipe off? If not, it is not candidiasis. I suspect you are seeing Fordyce granules which are benign sebaceous glands inside your mouth. Not everyone has them. No treatment is necessary. I would still highly recommend you have a dentist look at it.
See a dentist. The white dots could be anything from candida/thrush (yeast) to malignancy. See a dentist soon and be evaluated.