Looking for information about other Dental Topics? Full Website Index•    Animated-Teeth.com    • All topics.  »All Whitening Strips pages.  »Using whitening strips – Continued. Directions for wearing Crest Whitestrips® – Part 2 This portion of our guide covers →  How long are whitening strips worn? | How frequently? | Wrapping your treatment session up. | When … Continue reading How to use Crest Whitestrips – How long & often are they worn?