When will I start to see results? June 17, 2021 12:58 Updated You can expect to see visibly whiter teeth in just one week. Related articles How many shades whiter will my teeth get? Why should I choose this whitening pen? Is there an interval in between treatment cycles? How much time should I wait to go through the whitening cycle again? Can I use this with a mouth guard or Invisalign type of braces? What age range is hum kids by Colgate smart manual toothbrush suitable for? Comments 0 comments Article is closed for comments.