Amazon also has
Crest 3D White Brilliance Daily Cleansing Toothpaste and Whitening Gel System (4.0oz and 2.3oz) on sale for
$6.72 when you clip the 25% off coupon on the product page and apply promotional code
3CREST2STEP at checkout.
Shipping is free with Prime or on orders of $25. Thanks johnny_miller
Note, must be logged into your account. Coupons are typically one use per account.
No Longer Available:- Amazon has 14-Treatment Crest 3D Whitestrips Teeth Whitening Kit on sale for $14.90 when you 'clip' the $15 off coupon found on the product page. Shipping is free.
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If they are saying 10 strips can get my teeth white, why would I need to get 4 more and pay more if the same outcome is to get my teeth white?🙃
My guess is it depends on the individual. How many shades of yellow that needs to be removed before they obtain their desired shade of white, how much enamel they still have left, what kinds of staining food and drink they consume on a daily basis (black coffee), dental hygiene habits, etc.
You could always keep the extra strips for touch-ups in-between whitening sessions. I think they have a long shelf life.