The oral cavity is the initial part of the digestive tract. The anterior fissure communicates with the outside world and then continues to communicate with the pharynx through the pharyngeal isthmus. There are teeth, tongue and other organs in the mouth. The front wall of the oral cavity is the lip, the side wall is the cheek, the top is the palate, and the bottom of the oral cavity is the mucosa and muscles.
The oral cavity is divided into anterolateral oral vestibule and postmedial oral cavity by upper and lower dental arches. When the upper and lower teeth bite, the oral vestibule can communicate with the inherent oral cavity through the space behind the third molar. Clinically, when the patient's teeth are clenched, an opener or cannula can be placed through this passage to inject drugs or nutrients, and at the same time, tongue biting can be prevented.
Extended data:
Food that keeps your mouth fresh.
Water and moderate drinking water can keep gums moist and stimulate saliva secretion. Drink water after eating, and take away the food residue in the residual mouth, so as not to let the bacteria get nutrition, take the opportunity to make trouble and damage the teeth. Drinking method: Everyone needs to drink 6 ~ 8 glasses of water every day, especially after meals. If you can't brush your teeth immediately, remember to drink a glass of water to clean your mouth and reduce the chance of tooth decay.
Mint and mint leaves contain monoterpenoids, which can reach the lungs through blood circulation and feel fresh when breathing. How to eat: after eating a big fish and meat, drink a cup of mint tea without sugar to relieve fatigue and abdominal distension; If you are afraid to speak because of the pungent smell of onion and garlic, it is recommended to chew 2 ~ 3 fresh mint leaves or coriander to help remove these embarrassing smells.
Lentinus edodes and mushrooms have not only become popular foods to enhance immunity in recent years, but some studies since 2000 have also found that they are also helpful to protect teeth. The reason is that lentinan contained in shiitake mushrooms can inhibit the bacteria in the mouth from producing dental plaque. Eating all kinds of mushrooms 2 ~ 3 times a week is a simple and cheap health care method.
References:
Baidu encyclopedia-dentistry