According to a 2004 study, scientists found that a 5 percent hydrogen peroxide solution was just as effective as a 25 percent solution at whitening teeth. But to achieve the same level of whiteness, one would need to whiten teeth with the 5 percent solution 12 times to get the same level of whitening as one time with the 25 percent solution.
This means if you’re using short, low-concentration treatments, you’ll have to perform more treatments to achieve your desired whiteness.
