Whiter teeth
Thought I'd try this pen since I've had long time coffee stains and red wine stains, which are quite noticeable when present. After a week of using I started seeing a difference. Am on my 3rd pen and I continue to see my teeth getting whiter. Pen is easy to use, leave the gel on for 20-30 mins then you can get a drink of water to rinse it off.
Rating: 4 stars