How does Xiao Suda whiten her teeth?

I also heard that baking soda can whiten teeth, which is true. My aunt tried it herself and it really worked, but she must stick to it.

But my prescription is baking soda+edible salt. advance

Brush your teeth first, then brush them again with soda and salt. There may be too many reasons for your pain. Just touch less, brush slowly, and stick to it, but to be honest, whether you put soda or salt, it doesn't taste good in your mouth. . But for the sake of white teeth, bear it.