“How long does laser whitening of teeth last?”

In our office, we only use the "office whitening" (stronger % of whitener) if the patient has a job interview coming up real soon. After 6 months, half the whitening is gone. The "laser" is mostly hype, and not worth extra $$, as studies show that the whitener used gives the same effect whether the laser is used or not. And most of the people who use it need to still do "at-home" whitening to keep the effects long term. Save the money, go to Walmart and buy the Crest 3D WhiteStrips (not the "professional" version. According to Consumer Reports, the WhiteStrips were the best of the at-home whitening systems at the time they tested them, unless you have a wedding or job interview coming up in the next couple of weeks.

It depends on your dietary habits (coffee, wine, soda) longer lasting are trays.