The first thing to say is that taking porcelain teeth to do orthodontics is not advocated, porcelain teeth are mainly used to change the color of the teeth, such as severe tetracycline teeth, fluorosis, dental development problems and so on. If the color and shape of the teeth are normal, only the position is not good, it is best to strongly recommended to do orthodontics, is braces, steel teeth sister. Orthodontics although a little longer, generally more than two years, but it is very little damage to the teeth, far less than porcelain so much, so can orthodontics, do not do porcelain. Twisted tooth to do porcelain need to take the nerve. (Normal porcelain is not required to take the nerve) serious even need to cut off the crown, a stake. What is the nerve to do? We commonly called the nerve, in fact, including a group of things: the nerve of the tooth, blood vessels (arteries and veins), lymphatic vessels. We often say, the nerve is inflamed, the nerve hurts. It is actually a process like this. There is inflammation, the blood vessels are congested and compress the nerve, and the reaction is neuralgia. The treatment at this time is often to open the tooth and release the blood that is filling the blood vessels to relieve the pressure. Later, it is to remove the inflamed and necrotic blood vessels and nerves, and then plug the cavity. We generally call this root canal treatment, or root canal filling, or root filling. Root canal treatment is usually for bad teeth, inflamed teeth, and teeth where the nerve cannot be preserved. It is a last resort. The porcelain teeth to do orthodontics to remove the good nerve, which is a bit unfortunate. The main role of the nerve is to transmit messages, the main role of blood vessels is to transport nutrients. After these are taken away, the teeth will be no nutrition and slowly become brittle, and the teeth because there is no nerve and encounter injury when the brain can not transmit information and lose the function of self-protection. Of course, it is said that the tooth will become brittle without the nerve has some doubts in some Japanese counterparts, and the statement that it is better to wrap the crown without the nerve is not accepted by everyone. Twisted teeth for porcelain, the lower teeth sometimes need to adjust the grinding some. Generally speaking, when the upper teeth are twisted, the lower teeth tend to have a little misalignment. The space where the upper teeth are twisted over is often filled with a little twist of the lower teeth. Then when the upper teeth are aligned, the lower teeth often need to be ground in order not to top the upper teeth. The little bit of grinding, because it belongs to the position of the teeth can clean themselves, but not too much damage to the teeth. Twisted teeth do porcelain alignment after the space is often not enough, the tooth may appear narrow, appear small. Because if the space is enough, the tooth will not twist, it is because the position is not enough, the tooth is “crowded”, so when the crooked teeth become straight, there may be a narrow, thin teeth, how thin, depending on your personal situation. So it is often necessary to grind a little bit of the teeth next to each other to make some space for this tooth. In many cases, the twisting of one incisor may also lead to the displacement of the opposite incisor, so the tip of the nose, the middle of the person and the middle of the tooth are not aligned, so for aesthetic reasons, it is necessary to grind the teeth next to it. The location of this grinding, and above we say the location of the grinding lower teeth is different, that location after grinding generally will not cause tooth decay, but the location of this tooth grinding is the side, and we do find a porcelain teeth is close to the place, this place is easy to accumulate food, easy to decay out of the cavity, so this place must do a good job of cleaning, the best use of dental floss, or dental flosser. After the porcelain alignment of the twisted teeth, the gum height may be uncoordinated. Generally speaking, most of the gums of the twisted teeth and the corresponding teeth next to the height is not the same, because the teeth are twisted, almost horizontal, the gums will be topped out, this time if the teeth are lined up, the porcelain teeth will generally be longer than the teeth on the opposite side, the teeth will be a long and a short, many times can not achieve your desired effect. Then this time may also need to do a small surgery on the gum of the opposite tooth, crown lengthening surgery. Of course, these are the things that reverse the personality of the tooth to do porcelain. There are also many disadvantages common to porcelain teeth, such as the edge of the closeness of the problem, the comfort of the problem, the life of the tooth, and so on.