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" How often can I whiten my teeth? Are there any side effects from doing it too often? &amp;amp;#147;It&amp;amp;#146;s safe to do once every six months,&amp;amp;#148; says NYC cosmetic dentist Pia Lieb. &amp;amp;#147;Any more will strip away your enamel and cause tooth sensitivity.&amp;amp;#148; Switch to a kit formulated for sensitive teeth, like Crest Daily Whitening Plus Tartar Protection, $39.99. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cosmopolitan.com/style-beauty/beauty/how-to/a731/Frequen-Whitening/>