If you've got a systemic illness such as diabetes or cardiovascular disease, you may have to work harder to maintain your oral health than those without such illnesses. Studies have shown a link between dental health and these problems, so consult your dentist about what you should do.

Another reason to eat right is that dental health has been demonstrated to progress farther and faster in people who don't provide their bodies with enough nutrients. If you suspect you haven't been getting enough nutrients, get your diet in order and try some supplements.

What do dental health, obesity, high blood pressure, and diabetes have in common? They're all caused or exacerbated by overeating. It's a good idea to cut down on your food consumption anyway if you're overweight, but it does have the added benefit of improving dental health.