As the saying goes, “a toothache is not a disease, but a pain that kills you”, in fact, teeth are an important organ of human beings, if it hurts, it must be sick, and the disease is not light! Just because we have a large number of teeth, so one or two bad teeth temporarily on our chewing function is not much, so people do not pay attention to, wait until we are older, more bad teeth on our life caused by the impact, we know how painful it is without teeth. Just like we can’t walk when our feet are twisted, we realize how important our feet are. Toothache is indeed the most unbearable pain for people. Why is a toothache so severe? The following diagram of the structure of a tooth will tell us why: The pulp is what we usually call the dental nerve, and it is the root cause of toothache. The yellow one is the nerve, the blue one is the vein, and the red one is the arterial blood vessel, which grows from the bone and enters the tooth through the apical hole. We know that in the circulation, the arteries bring in fresh nutrient-laden blood, have thicker walls that don’t collapse and clog, and pulsate as the heart pumps. Veins, on the other hand, take the used blood away from the tissues, and their walls are thicker and can collapse under pressure, causing blockages. When we have a cavity, or a microcrack in the tooth, bacteria will enter the pulp, and our pulp will find it, and then the blood vessels will release bactericidal substances, cells, etc. to fight the bacteria, and the more bacteria that enter, the more bactericidal substances will be released. This is a positive defense response of our teeth, but “a wise man must have a mistake”, our teeth did not expect that its apical foramen is quite narrow, just enough to accommodate our blood vessels and nerves to enter, when too much is released, the pressure inside the closed pulp chamber surrounded by dentin increases to a great extent, which in turn When too much is released, the pressure inside the closed pulp chamber enclosed by the dentin increases to a high level, which in turn squeezes the tissue at the apical foramen, causing the veins to collapse and become blocked. When we lie down, the blood pressure in the head increases and the pressure in the pulp becomes even greater, so many people have more pain when they sleep, and the pressure in the pulp cavity changes with the pulsation of our arteries, resulting in a throbbing pain. When our teeth encounter hot and cold stimuli, the pressure in the pulp will also change and pull on the nerve to produce severe pain. At this point, I believe you understand why medicine does not work when you have a toothache. The only way is to drill a hole in the tooth and open the pulp to reduce the pressure, which is why the pain disappears immediately after going to the hospital to open the pulp.