FREE Sample of Crest 3D Whitestrips Regimen With Advance SealFebruary 17, 2010 This post may contain a link to an affiliate. See my disclosure policy for more information. Walmart is offering up another great freebie! Go here to grab a FREE sample of Crest 3D Whitestrips Regimen with Advance Seal. Just skip past all the intro stuff. Allow up to 4 weeks for delivery.