It is a teeth whitening product.

It is a Japanese teeth whitening product.

Since I enjoy drinking coffee, I can't prevent my teeth from becoming discolored.

I've only been using it for 7 days, but visually, it looks like it has gotten about half a tone brighter.

I heard that teeth whitening products don't last long, and last for at most two weeks.

Because I heard it puts a strain on the teeth and gums.

The tip is to use it carefully, avoiding contact with the gums as much as possible.