On my upper left side my gums are real sensitive and I have noticed that looking at them the gums are blotchy, real red and white spots. My dentist said it can be a virus and if it gets worst, I should go and get a buyopsy to check for cancer. He noticed I have another patch on the other side of mouth, on the upper area. I was told by my dental assistant that some of the tooth pastes now days have all this different ingredents, whiter, tarter control,etc. That I might be using one with something that my gums don't like. I changed my tooth paste to senitdyne and it seems to help, but not completely. Is there something I need to do now?