Taoism is natural, and those who violate it will die.
The so-called tip of the tongue, translated into modern Chinese Putonghua, means, shut up,
For the elderly, the weak and the sick, it must be clearly stated that it is awkward to shut up (the tongue with severe kidney deficiency cannot be said). The so-called tongue top is to put your tongue flat and keep your mouth closed. More precisely, after a healthy person shuts up, his tongue sticks to his upper teeth.