Finance Pro Vivian Tu Spills on Her Smartest Prime Day Finds

Crest 3D Whitestrips Sensitive At-Home Teeth Whitening Kit ($30, originally $50)

Tu and I can both agree on the power of Crest Whitening Strips. "People always ask me how I get my teeth so white — it's these strips!" says Tu. "I've been using them for years. Plus, they don't make my teeth overly sensitive." Available in a pack of 18 treatments, you can count on these to gently and safely remove stains effectively. And at 40 percent off? You really can't go wrong. Read our Crest Whitestrips review for more.

Editor Quote: "After just four treatments, the difference is already remarkable. The "before" image on the left and the "after" image on the right clearly shows the noticeable change. And I've barely made a dent in the box with plenty of treatments left." — Marisa Petrarca, contributing editor, Shopping