I bought it casually, it's so white that I can't sleep

Previously, due to rushing in the morning, I often didn't brush my teeth, which resulted in my teeth becoming increasingly yellow and even my mouth turning red, making my teeth appear darker and heavier. Later, I tried this whitening toothpaste with Blue V certification, and found that its foam was very delicate, and it felt mild and non irritating when brushing. After using about one, the most noticeable change is that the surface of the teeth is less prone to coffee stains, and overall it looks cleaner. A few days ago, when I was applying rose red lipstick, my teeth didn't show any yellowing. My colleague even asked me if I had secretly done teeth whitening. Actually, there's no special secret, it's just brushing your teeth carefully and choosing the right toothpaste that really works.