Go Smile Speed Whitening System
Our last tester, Leah, was attracted to Go Smile's Speed System after reading that results are seen after the completion of the four-day system. A small tube of primer, followed by a small tube of the whitening agent, goes on morning and night. Unlike a tray or strip, the product dissolves on its own, and there's no need to do anything after the initial application.
Source: Elizabeth Griffin/Hearst