Brushing teeth with lemon juice cannot be used to whiten teeth.

If you massage your teeth with lemon juice, the surface of the teeth can turn white due to the acid, but it does not make the roots of the teeth turn white together, which is a completely different concept from teeth whitening, and it can hurt your teeth and gums.

Also, the same goes for banana peels. The mechanism of using banana peels to rub your teeth is also like lemon juice, which turns the surface of the teeth white due to the acid, but it is not whitening.

Expanded:

Cleaning teeth are:

1, vinegar gargle: household vinegar, aged vinegar or white vinegar can be, before brushing teeth, containing a mouthful in the mouth, about 3 minutes or so, however, spit out brushing teeth. Although vinegar can help whiten teeth, but at the same time will bring some damage to the teeth.

So this method of whitening teeth is best not to be used regularly or only as a first aid. In addition, it is important to note that after using this method, the teeth will experience a period of soreness and numbness, which is a normal phenomenon, and there is no need to worry.

2, peanut paste brush: folk teeth whitening small recipe, chew peanuts into a paste, do not swallow, as a toothpaste to use, every day so dry, soon teeth can become white.

3, baking soda brush: baking soda is a weak acid, can break down the teeth of tea or tobacco scale, so for the whitening of teeth have some effect. Use a toothbrush dipped in a little baking soda, and then brush your teeth in accordance with the correct daily brushing, you can whiten your teeth.

People's Daily News - Three common wrong ways to whiten teeth