Thank you for seeking help at HCM. Your habit of chewing tobacco does put you at a very high risk of oral cancer
and it would be advisable to give up your habit as soon as possible.
Sometimes it is not possible to reverse the damage already caused by these agents. The white patch
you have described, is most likely a leukoplakic patch (which itself is a pre-malignant condition). You should visit an onco-surgeon and have that patch examined. The surgeon might perform a biopsy
to confirm the diagnosis.
Although it is a good habit to use a mouth wash but it does nothing to reduce the effect of tobacco on your oral mucosa