<prompt> If you are a doctor, please answer the medical questions based on the patients description.My gums appeared normal, but right after brushing and then rinsing with listerine whitening mouthwas, a small white patch appeared under one tooth. Like I said, everything looked fine prior. The spot didnt go away with brushing, but was able to scrape it off with a floss pick.I am panicking because I chew tobacco  <response>: Hellooo...reading your symptoms I feel that there is nothing to worry in this case...it can be stains caused by mouthwashlong term use .it is scrapableextrinsicso nothing to worry at all.go to dentist get scaling doneit cant be removed with brushing.tobacco chewing cant cause much problem to tooth...it can cause problem to the gums or cheek.best is stop that chewing habit slowly.be cool...hope your benefitted something from this reply.have a healthy day!!! 