Hello Maiku....
I am no doctor, you may find the link below helpful, but the very site you are in now (OCF) provides a wealth of information to look through and become informed.
http://www.cancer.gov/cancertopics/pdq/screening/oral/Patient/page3 National Cancer Institute
In my opnion your best defense is regular checkups by a dentist who is very knowledgeable about Oral Cancer as well as your own personal exams if you should see changes in your mouth you do not understand or that last more than 2 weeks.