How white can I get my teeth?

Some of it is up to you; some is up to Mother Nature. Your tooth enamel is a unique shade by birth. GLO will get your teeth as white and bright as they can be. This will also vary by whether you choose to do in-office or at-home whitening. If you want to go whiter after 5 days of home use, continue on for another 5 days as long as you don't experience any sensitivity.