socioeconomic status is a risk factor so we want people to know. the role of a dentist is extremely critical. a good dentist can really look in and diagnose hiv, oral cancers and so many other -- even cardiac disease. we have t gingivitis, et cetera. >> my dentist looks under my tongue, which they never used to do before. mark, what do you think? >> three quarters of the oral cancers and throat cancers are due to smoking or alcohol or at least they are smokers who drink. if you cut down on alcohol and tobacco, you help the problem enormously. then what is your oral hygiene like? are you flossing? because that's how you get rid of gum disease or prevent it with flossing. and are you brushing a couple times a day? we have covered that on the show before. that's the key. are you using mouthwash to cover-up the fact that you have not brushed your teeth today? brush your teeth and floss, maybe if you're going out to an event you can have a little mouthwash, but don't use it three times a day.