This 22-pack of Crest 3D Whitestrips is down to just $29.99 during Amazon Prime Day.

The Vivid Plus White Strips are the cheapest available from Crest on Amazon, coming in at under $24 with this deal. Fittingly, the $24 pack comes with 24 strips, equivalent to 10 whitening treatments.

Crest Whitestrips are majorly on sale at Amazon for Cyber Monday (close to 40% off!), and according to celebrities, they’re the secret to a pearly white smile.

Shop this best-selling Amazon Cyber Monday to get Crest 3D Whitestrips for less than $28. Save 39% on the popular whitening strips for a limited time.

A PS editor tested the Crest 3D Whitestrips and saw significant whitening results in just days. See before and after photos here.

Crest white strips are 35 percent off during Prime Big Deal Days. One PEOPLE shopping writer tried the Crest 3D Whitestrips, which have a “no-slip grip” and 68,000 five-star ratings on Amazon.