Great Product!
This pen works! I am a coffee drinker and wine lover so my teeth get yellow fast. I have used other whiteners before but they have always blistered or hurt my gums. I have more control with the pen so less gets on my gums but also if it does, it tingles but doesn’t hurt! After 3 days my teeth were noticeably whiter!  And the pack comes with two! When I run out I’ll be sure to get more of these!
Rating: 5 stars