Niacinamide Whitening Pen

Lower teeth don’t seem to have whitened at all .. with either pen or toothpaste

I have a tooth in the front bottom that was damaged through an accident and over the years it has slowly started to discolour, and when I received my order I gave the pen a go on it, just to see how it would work and wow ! Amazing! Could not believe the difference, it’s my go to now before heading out .

No whitening has been observed.