People have a set of self-regulation mechanism (buffer system) to prevent their pH from changing greatly, so under normal circumstances, external factors will basically not affect the pH of the body. Even if you often drink a large cup of vinegar or alkaline water, the body's pH will not fluctuate too much, not to mention brushing your teeth with baking soda, which will not make your body alkaline.
Moreover, the pH of the human body cannot be changed casually, and it must be between the normal pH of 7.35 and 7.45. Too little or too much is harmful to health, so the idea of adjusting the body to alkalinity is unscientific in itself.
In addition: baking soda itself is an alkaline substance. Long-term brushing with alkaline substances will damage enamel and dentin, which will do some harm to teeth.
Brushing your teeth with baking soda is not recommended.
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