Teeth Whitening Through Laser – Quick vs. Lasting

There are several laser tooth whitening systems in use in the dentists’ office.  Some are “pulse” lasers, some are broad spectrum, some are gel activators.  There are several methods and the one your dentist uses to do teeth whitening will depend on what’s available and what is to be done to whiten your teeth.

Fast laser treatments have been all the rage in teeth whitening, but new studies are showing that while it’s a faster treatment than in-clinic soaking (tray bleaching), it’s not necessarily better.  Or as good, even.

What’s being found is that the tooth whitening is not necessarily a bleaching, as previously though, but is actually a dehydration of the teeth from the intense light of the laser.  This dehydration leads to whitening, of course, but the laser tooth whitening can fade quickly as the teeth rehydrate after a few days.  Further questions of what it might be doing to affect enamel are also being raised.

Here’s why that is: bleach gel is usually applied to the teeth and then the laser is used to “burn off” the gel, theoretically forcing it into the teeth through heat.  In reality, most of the gel evaporates into the air, doing nothing to aid tooth whitening.  Some of it does, of course, get forced into the teeth as well.

The problem is that in most cases, that bleach is not enough and is not there long enough to do anything beyond a slim surface whitening.  The deeper coloration of the teeth (call the intrinsic coloration) is unchanged.  Further, the bleaching is so light it may not have any visual effect at all.

Most of the laser tooth whitening effect on many teeth appears to be the forcing of water from the teeth, dehydrating them.  This naturally lends a whiteness, but this new tooth whitening lasts only a few days while the teeth recover.

This is why the longer tray whitening methods seem to have a longer-lasting effect, though it is slower to appear.