I feel that it will take at least a month to see the real effect of tooth whitening. Teeth will be whiter, and even very old tartar can be brushed off, but it has not completely fallen off. I am very satisfied with some of them.
However, there are also side effects, that is, the teeth will be very sour in the later stage, and eating slightly sour fruits can't stand it. So at the beginning, Brother Bao suggested that if you buy a small suit, you should not continue to use it after using it. Teeth really can't stand it.
Personally, it is recommended to choose a manual toothbrush with a small brush head. I'm worried that my teeth can't stand the strong acidity of this electric toothbrush and the high frequency of brushing with it.
Finally, personal statement: If you have dental disease, your teeth are sore and your gums often bleed, it is strongly recommended to consult a doctor. I will regret it a little after using it. My own teeth are not particularly good, and they will be fragile for a while after use.