Need to hear more? Check out these 5-star reviews from folks who love their teeth-whitening pens. “I love these purple teeth whitening pens! They Really Work! On my first try with the first pen ...

It looks like Microsoft made the limited edition Surface Slim Pen in 4 colorways: orange, yellow, purple, and blue. Unfortunately, we only have good images of the orange Surface Slim Pen via a ...

Interestingly, Nader noted that the purple pens always lasted longer than the other colors, which likely nods to the formulation that makes the ink purple. “Just as there are trade secrets with ...