I had a bad throat infection a couple of weeks ago and was treated with clindamycin. Now I was using probiotic yogurt drinks but did not drink any for a few days and now I have this white coating on my tongue again. This same coating appeared when my infection went away but now it is back? What does this mean? Should I consume more probiotics? Could it be some underlying condition? I don't think it's HIV because I've never had sex or used needles. Thanks