About six months, according to Kohli. Depending on what you consume, that is: If you love red wine, cola, anything with artificial colorants that can stain your teeth, then you might need touch ups sooner, she explains.
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So what happens immediately after you get the treatment done?
Well, Kohli says that most dentists will suggest taking an anti-inflammatory an hour before or after the treatment, so there are no "zings of sensitivity," as she puts it. But you also need to be very careful of what you consume for the next 48 hours after the treatment, since "the teeth are dehydrated and the enamel rods are opened" from the treatment.
Bottom line? Teeth whitening doesn't have to be a big deal — but you should still be careful when doing it and heed your dentist's advice.
