CHECK YOUR MOUTH 
Oral cancer kills one person in America every hour of every day, 24-7-365. Of those newly diagnosed today, about half will be alive in 5 years. Even surviving this disease will mean that you endured brutal treatments, and leave you with life-long issues that will compromise your quality of life. It is very important for you avoid this disease when possible, and know how to recognize and find early symptoms of it, so you might then self-refer to a dentist or other professional to have suspicious things evaluated. Caught early, every negative part of this; from treatments to ultimate outcome, are lessened in severity. Oral cancer checks are performed at every preventative hygiene appointment, but you should be periodically checking at home.
There is a website that is full of information, and contains a tutorial for self-mouth checks to do at home.
Check out : http://checkyourmouth.org/