What is the effect of Yixiudun toothpaste on whitening teeth? Who used it? Tell me about it.

Personally, I feel that the whitening effect of Yixiudun toothpaste is great. My teeth are yellow because I smoke. Later, my wife came back from a trip to Korea and brought me this kind of toothpaste. After just brushing for two or three days, I can find my teeth turned white in front of the mirror. It really surprised me. In the past, brushing other toothpastes could not whiten teeth, but a rest toothpaste did.