03-15-11 | Posted by Dorene Kaplanteeth whitening alternative to Crest Whitestrips. Now I’m not saying ( and I don’t believe that Crest is either) that the results will be identical to the 20 week treatment, but the new 2-hour strips are formulated to deliver noticeably whiter teeth in just one two-hour treatment with results lasting up to three months. And to supplement the effect, Crest has created Advanced Vivid Enamel Renewal Toothpaste ($4.25), which removes up to 90% of surface stains in just 14 days. This just launched paste can be used in conjunction with a whitening program – or not. To celebrate this dual launch, Crest spokesperson, actress Amanda Peet, announced that Crest will donate up to 50 smile surgeries to Operation Smile, the international medical charity that offers free surgical care for children with facial deformities such as cleft lips and palates.