Colgate Sensitive Smartfoam with Whitening is specially formulated for sensitive teeth, with 30% more foam*, it gets to tough-to-reach spaces and helps keep teeth whiter. *vs. Colgate Sensitive Whitening TP. Plastic Contains Potassium Nitrate, clinically proven to soothe the nerves in exposed dentin Provides fast relief within two weeks Builds increasing protection against sudden shocks of painful sensitivity Provides long term relief with regular use with a great tasting flavor Gets to tough-to-reach spaces and whitens Safety Warning When using this product, if pain/sensitivity still persists after 4 weeks of use, please visit your dentist. Stop use and ask a dentist if the problem persists or worsens. Sensitive teeth may indicate a serious problem that may need prompt care by a dentist. Keep out of reach of children. If more than used for brushing is accidentally swallowed, get medical help or contact a Poison Control Center right away.