Maliciousness. Not Incompetence. Posted by Jammie on Jul 28, 2014 at 1:41 pm One Response to “Maliciousness. Not Incompetence.” Vicki on 29/29/14 at 3:45 am Hence, you’ll have your yellow and discoloured teeth vacation white in no time. I do not dilute my peroxide, and most people don’t when using hydrogen peroxide teeth whitening. If you are wearing a bright white shirt, it will only make teeth that happen to be not so white style much more dull and yellowed.