With advances in chemistry and technology, teeth whitening has become huge business. Of course, everyone wants white, nice-looking teeth, not yellow stained teeth when they smile.

The main causes of stained teeth are coffee, drugs, tea, tobacco and colas.

It boosts self-esteem and makes you feel better about yourself, just like wearing a great outfit. When a man puts on a suit and tie, he feels a little more like a man. And when a woman wears a nice dress, she feels a bit more feminine. That’s human nature.

Studies show when we feel like we look better, we naturally feel better about ourselves. We live in an appearance obsessed culture, and it’s going global. In China, you hardly ever see anyone with grey hair, even among older folks. Everyone dyes it. Youth is idolized today like old age was venerated in times of old.

It used to cost hundreds of dollars at the dentist’s office to whiten your teeth. Not anymore. Now for about $30 you can be well on your way to a whiter, brighter smile. But there are limitations and not every product is a miracle product.

Bleaching, for example, which is very common in the drug [...]