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Smokers should stop smoking before having their teeth bleached. Smoking not only defeats the effect of bleaching, but some researchers are concerned about the effect of smoke on hydrogen peroxide bleaching gels. There is some evidence to suggest that the combination of the gel and smoke may add to tissue damage, which we already know to be caused by smoking.
You can have your teeth whitened if you are pregnant, although many practitioners would probably advise you to wait until after you have given birth to avoid any possible risks.