SAVE $11: As of Oct. 21, the Crest Whitening Strips are on sale for $34.99 at Amazon. That's a 24% discount on the list price.

$34.99 at Amazon

$45.99 Save $11

Coffee lovers, tea drinkers, and red wine fans know that keeping teeth stain-free isn't always easy. At some point, even the strongest whitening toothpaste is no longer up to the job, and help from teeth whitening strips is needed. But not all strips are the same, and some are much more effective than others.

Crest's whitening strips are among the most popular brands, beloved for their at-home whitening that doesn't require booking a professional treatment.

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And right now (as of Oct. 21), a box of Crest Whitening Strips costs just $34.99 at Amazon , down from $45.99. That's the same price the strips hit during Prime Day. Each box contains 22 treatments, so there are plenty of applications included.

Crest says its whitening strips can brighten teeth by up to 19 shades in 22 days.…