Smirk Teeth Whitening Strips – A Smile That Sparkles, Dentist-Approved Strips Safely Remove Staining Caused by Coffee, Alcohol, Food and Smoking, Perfect for Sensitive Teeth

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So when I use these (once a week) I pre clean with the Smirk powder, rinse with the foam, and then apply. Try and get your teeth as dry as possible before applying. You don’t get any sensitivity from them and they gentle on your gum line too.