Photo by @crystalmariesing on Twenty20.com You’ve seen the ads. By using either strip soaked in a special solution or by brushing your teeth with a special formula, you can whiten your teeth. Many consumers are opting for these less expensive forms of teeth whitening. Others may choose to have their teeth bleached by a dentist, while still, some go for a full veneer set of teeth whitening in true “extreme makeover” fashion. But how do these teeth whitening products work? And do…