Why is it? Dentist advertisments

This will be a title of topics "why is it" for things and people of non-sense!  Soooooo "why is it" that dentist are the only medical "practice" that have commercials wanting you to visit the dentist. I'm not an anti-dentyte but why are people's teeth so bad now according to these "dentist" that we have to hurry and search 1800dentist. Why is plaque so bad now? I thought all these new toothpaste, mouthwashes, floss, etc.. worked?? They are the only profession that request our business. Screw those con artist , you know you only go if you have a cavity or your teeth hurt "thats it"!!! look just brush and wash and floss daily and you won't have to go...... Just watch the tv and see all the ads, You don't ever see a doctor saying "hey come in and let us hook you up to are EKG machine cause your heart is bad!"