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.
Rating: 5 stars