The mouth is the first line of defense for digesting food. Teeth are responsible for chewing and grinding food, and enzymes in saliva can further decompose ground food.
If the teeth are bad, it also includes the tooth decay you mentioned! The chewing function becomes worse, and some foods cannot be fully ground and decomposed, and directly slide into the stomach.
Our stomach, originally a second-line digestive organ, now has to take on extra work to help digest food that has not been ground and decomposed by the mouth, and the burden will of course increase. Moreover, as soon as the workload of the stomach increases, it will secrete more gastric acid to accelerate digestion, and too much gastric acid will easily cause gastric ulcer.
Therefore, the chewing function of teeth is not perfect, and the chain effect is to damage the moral health of the stomach and intestines, which in turn affects the whole body. By the same token, if you are lucky enough to have healthy teeth and gobble up food, you are abusing your stomach. After all, we are not wolves or tigers, so please give full play to the function of human teeth, chew slowly and enjoy the delicious food.
Finally, bad teeth can easily lead to malnutrition. Because of bad teeth, it is difficult to eat for a long time, and there will be uneven nutrition intake. Malnutrition can lead to poor health.