Dippers often get white patches where they hold the wad of chew. This one of the first steps to cancer, but usually is not cancer yet, but a precancerous condition known as leukoplakia. While I still hold out hope for dentists to eventually become our first line of defense against this disease by opportunistic screening of everyone that comes into their offices, they are not as a group up to speed yet. OCF is in the process of changing that but it will be years end before we get an educational movie co-produced with various other oral cancer and dental entities into the hands of 130,000 dentists. In the meantime tell your dipping friend to get a new dentist. This one doesn't have a clue.