The craze of tooth whitening, that's been going around and is getting more popular and more people gain interest in, as smokers and coffee drinkers don't want their habits to reflect their smiles.
So there are gels, the stripes, the gel with light, zoom, etc. etc.
An article on MSN Health & Fitness, breaks down the Tips & Tricks to whiter smiles.
the Article is below and here is the link to it: http://health.msn.com/centers/oralhealth/articlepage.aspx?cp-documentid=100124848>1=8921