As the saying goes, “People are food-oriented, and food is tooth-oriented”. Teeth are the organ that directly exercises the function of chewing. Imagine how you can enjoy the pleasure of food without teeth. The teeth, lips and tongue are jointly involved in pronunciation and speech, and a missing front tooth will feel inaccurate and unclear pronunciation, as if the speech is “leaky”. A small tooth can really be called out for a thousand years. Both milk teeth and permanent teeth are differentiated, grown and formed in the mother’s womb, and it takes a few years or even 20 years after birth for a person to gradually develop and mature, a long and difficult journey, during which any adverse stimuli, such as fever, improper medication or high fluoride content in drinking water, may affect the normal development of teeth. The World Health Organization has proposed the “8020” campaign, which calls for people to live to the age of 80 with 20 healthy and functional teeth in their mouths. From now on, let’s treat our teeth well and let them serve us for the rest of our lives.