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Whitening toothpastes help to remove surface stains while brushing through abrasive properties. Most whitening toothpastes are not recommended for long-term use due to their abrasiveness. However, due to Opalescence Whitening Toothpaste's formula, it is gentle enough for everyday use while still abrasive enough to remove enamel surface stains. Tooth sensitivity is a relatively common side effect of whitening. If sensitivity occurs, it is transient and disappears after the completion of the whitening procedure. However, most Opalescence products include PF (potassium nitrate and fluoride) desensitizing agents for additional comfort. Findings have confirmed that the potassium nitrate and fluoride actually help to reduce cavities, minimize sensitivity, increase enamel hardness, and improve the overall health of the teeth.1-5 Research has shown that just as hydrogen peroxide penetrates through the enamel and dentin to the pulp, so does potassium nitrate. Potassium nitrate acts more like an analgesic or anesthetic by keeping the nerve from repolarizing after it has depolarized in the pain cycle.17 Fluoride acts primarily as a tubule blocker, plugging the holes and slowing down the fluid flow that causes the sensitivity.