What it is: A teeth whitening pen designed in collaboration with Kendall Jenner.What it does: Sleek and chic, this whitening pen is the perfect addition to your oral beauty care for powerful yet gentle whitening touchups on the go. How to use: Remove the cap and click the button at the end of the pen until the gel dispenses. Smile and brush a thin layer onto your teeth. Wait 30 seconds before closing your mouth and 10–30 minutes before eating or drinking. Apply up to twice per day for two weeks. Do not use in combination with coffee, tea or other substances that may impact the whitening effect.