7 months ago
The active ingredient you're looking for is called Potassium nitrate (and fluoride). Potassium nitrate works by actually clogging the "pores" (technically called 'tubules') in your tooth, if you will. This can aid in the sensitivity reduction experienced in whitening. It takes about 2 weeks to fully 'clog' the pores in the tooth though.
Web reference: http://www.MariettaGaDentist.com
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