Review (5/5): Better than the Expensive Whiteners offered at my dentist office
The Diaregno teeth whiting pen whitened my teeth like no other pen. After one use, I noticed a difference. It's part of my daily regimen. Works a lot better, and faster than the tray I purchase from my dentist office. The pen does not cause my teeth to ache, and they are shades whiter after I use it. I use it at least three times per week.