In general, it is recommended to brush your teeth directly with baking soda no more than three times a week; if you brush your teeth with a lower concentration of baking soda water, you can usually use it daily, but none of them are recommended for long-term use. It is generally believed that baking soda brushing is simply a cleaning effect, and has no significant whitening effect. Brushing usually does not whiten the teeth, but only removes the soft scale and some of the pigments on the surface of the teeth. Baking soda is alkaline and has a slight corrosive effect, but it is mainly used to clean teeth through physical friction and is not significantly different from the effect of ordinary toothpaste or salt on teeth. If you want to whiten your teeth, it is recommended that you seek medical examination for professional whitening treatment. It is recommended not to apply baking soda to brush teeth for a long time, the main component of baking soda is sodium bicarbonate, no matter which way, long-term application may cause damage to tooth enamel and dentin, and if baking soda water is eaten while brushing teeth, long-term, it will also have some effect on the health of the body.