
With 6 percent peroxide gel (among the lowest of Crest Whitestrip products), reviewers note that Crest Whitestrips Classic are better for users with sensitive teeth. However, the whitening process is also commensurately slower, requiring a two-week commitment to wearing the strips for 30 minutes twice a day. Once complete, however, the results can last up to six months. As with other Crest Whitestrips products, testers are displeased by the associated drooling and express that the strips are best worn at home.
Good Housekeeping editors highly recommend Crest Whitestrips Classic and say the product can lighten teeth up to three shades. Customer reviews posted on Amazon.com and Drugstore.com also give Crest Whitestrips Classic high praise for ease of use and overall effectiveness.

| Crest Classic 100% More Pack Whitestrips, 112-Count | |
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Our Sources
1. Drugstore.com
Overall, Crest Whitestrips products are standouts among Drugstore.com customers. Crest Whitestrips Classic is given a rating of four stars. Reviewers praise the effectiveness and often mention how this product is gentler on sensitive teeth than other whiteners they've tried.
Review: Crest Whitestrips Dental Whitening Formula, Contributors to Drugstore.com
2. Amazon.com
Amazon.com users give Crest Whitestrips Classic an average rating of four stars, praising the product's inexpensive price, lower peroxide content for sensitive teeth and perceived ability to whiten.
Review: Crest Whitestrips Classic, Contributors to Amazon.com
3. 85th General Session of the IADR
Crest Whitestrips Classic performed equally as well as two other whitening products in this blind trial. All three products showed statistically significant results after being used for one week.
Review: Safety and Efficacy Results of Whole Mouth Tooth Whitening Treatments, L.A. Stockert et al, March 2007
4. Good HousekeepingDetails/Subscribe
Good Housekeeping tests two over-the-counter whitening products for efficacy and recommend Crest Whitestrips Classic, which they say can lighten teeth up to three shades.
Review: Skip These Whiteners, Editors of Good Housekeeping, March 2006
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