1. Lemon can whiten teeth. Acids contained in lemon can reduce the yellow stain on the surface of teeth. The effect is more obvious after a long time of use. In addition to using lemon to whiten teeth, you can also use baking soda and edible alkali to whiten teeth.
 2. Lemon contains a large amount of fruit acid and vitamin E. It can whiten teeth, fade skin spots, and prevent scurvy. It can be said that lemon has a very powerful effect. The fruit acid in lemon can dissolve the attachments on the surface of teeth, leaving the teeth milky. Lemon can also improve the oral condition, making the oral cavity healthier.
 3. The way to whiten teeth with lemon is: after brushing teeth in the evening and rinsing with lemon juice, the long-term effect is very obvious. This method cannot be used frequently, but it can be used once a day, because excessive acidic substances will damage the enamel, and people with bad gum conditions should also ask the doctor to use it again.
 4. In addition to whitening teeth with lemon, baking soda and edible soda also have the same whitening effect.
 5. Baking soda
 6. Before brushing teeth, first wet the toothbrush with water, then dip the toothbrush with a proper amount of baking soda powder, finally squeeze the toothpaste, use it 3-4 times a week, and it will have an effect after three weeks.
 7. Edible alkali
 8. The use method of edible alkali is the same as that of baking soda. First dip it on the toothbrush and then squeeze the toothpaste. If you feel bitter, rinse your mouth with water.