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disappeared" for a year, lost 100 pounds, and Jia Ling's "Hot and Hot" successfully won the first place at the Spring Festival box office. In the movie, Du Leying (played by Jia Ling) learned boxing and "wanted to win once" The persistence touched the hearts of many moviegoers, and there were indeed scenes in the movie where she was beaten in the face and spit blood in her mouth during boxing. 
Sharp-eyed netizens noticed that during the boxing match in the movie, the fighters would wear something similar to braces and take them off until they rested; And only the upper teeth are worn, and the lower teeth are not worn. What kind of new equipment is this? What exactly is the use? Mouth guards: The "bell jars" of the teethThese braces are not used to straighten teeth, but to protect them. Braces, also known as mouth guards, are used frequently in high-risk, high-confrontation sports. In formal boxing, wearing a mouthguard has become a mandatory rule. At the same time, the size of the mouth guard should be appropriate, and athletes are not allowed to deliberately spit out the mouth guard during the competition. If the mouth guard is knocked out, it must be rinsed immediately and put on by the referee on the stage. Despite its small size, it has a long history. In the beginning, boxers used a variety of oral protective equipment, such as stuffing orange peel, cotton or sponge in their mouths, and biting rubber strips or wood in their mouths, but the protection was not good, and the taste was difficult to describe. It wasn't until the early 90s of the 19th century that Woolf Krause, a dentist in London, England, invented a mouthguard made of resin, which was effective in preventing boxers' lips from cracking, but at this time mouthguards were not widely used. In 1927, in a boxing match, Mike McTigue, a fighter who had always been on the dominant side, had to give up the fight because his lip was cut and bleeding profusely, and finally had to give up the fight and throw in the towel. Since then, mouthguards have been favored by more and more boxers and have really started to gradually become popular. 
Boxing Mouthguard|Source: References[1]The protective effect of dental guards cannot be ignored. When people engage in boxing, a violent and direct confrontational sport, the face may be directly impacted by external forces, and the athlete's own maxillary teeth and mandibular teeth will inevitably collide, and these momentary impact forces are easy to cause a lot of damage. Mouthguards can protect the mouth, head and neck by attenuating these impact forces. Specifically, firstly, the mouth guard covers all of the fighter's upper teeth, as well as some of the upper gums, and provides direct protection compared to direct contact blows. In layman's terms, slapping directly and slapping through a layer of quilt must be the most painful directly. According to the inverse proportion of pressure and force area, the teeth and gums are fixed as a whole by the mouthguard, which can effectively reduce the damage of the impact force to a single tooth. Second, the mouth guard is mostly made of polyolefin polymer compounds, which is not a hard piece of iron, with a certain softness and smooth surface. It covers the teeth and fills the space between the upper and lower teeth, turning hard teeth into a relatively soft surface, cushioning the impact of two teeth colliding and preventing teeth from inadvertently biting the skin of the mouth or tongue. Thirdly, the mouth guard can separate the teeth from the surrounding soft tissues of the lips, cheeks and tongues, forming a natural buffer zone between the cheeks and the teeth, effectively reducing the accidental impact force of the maxillofacial area and teeth, reducing the probability of tooth fracture or dislocation, lip and cheek laceration, tongue bite, jaw fracture, temporomandibular joint and cervical spine injury, and reducing the severity of the injury. What's more, without a mouth guard, there is a risk of temporal bone fracture or even head endangerment. Overall, this reliable protective layer greatly protects teeth, oral soft tissues, and jaw joints from trauma, as well as mitigating head injuries. 
Wear a mouthguard before the raceSource: Screenshot of "In the Octagon Cage" In addition to boxing and other combat competitions, it also exists in sports such as rugby, basketball and snow sports. However, there are slight differences in the choice of mouthguard for different sports. In terms of wearing style, sports mouthguards are generally worn in the upper dentition, such as basketball players, football players, etc., while hand-to-hand combat events such as boxing are often worn at the same time in the upper and lower jaws. However, although the double-layered full shape guard can protect the upper and lower teeth at the same time, it will affect breathing to a certain extent, and it is not very comfortable to wear. The single-layer mouth guard is mainly a semi-protective mouth guard that protects the single-sided teeth, which is worn on the upper teeth, which has little impact on breathing, and the protective effect is not much worse than that of the full mouth guard. Therefore, it is also common for athletes to wear semi-protective single-layer mouth guards during boxing training or competitions. The thickness of the wear is mainly affected by the gender and weight of the athlete, the degree of confrontation of the sport, etc. General sports can use 2 mm + 2 mm laminated mouth guards, men's ice hockey, men's short track speed skating and other 2 mm + 4 mm or 3 mm + 3 mm laminated mouth guards, boxing, basketball and other more confrontational sports need thicker laminated mouth guards. It is important to note that snow sports carry a high risk of injury, especially dental and oral trauma. A study by Peking University showed that in the 2017-2019 season, a large ski resort in Chongli counted about 4 injuries per 1,000 skiers5 cases, with an incidence of 45‰。The highest probability of injury was in the head and neck (18%), the knee (17%), and the wrist and fingers (13%). Specific to head and neck injuries, they mainly include broken or dislocated teeth, lacerations of the lips and cheeks, tongue bites, jaw fractures, temporomandibular joints, and cervical spine injuries. 
During the Winter Olympics, many athletes wore mouth guards when they participated in the competition, and the picture shows athlete Gu Ailing biting the mouth guardsSource: CCTV** Screenshot to summarize, don't underestimate this inconspicuous mouth guard, its role is very great. Boxing: a dangerous "game".Although the boxers are wearing mouthguards, gloves, etc., to protect themselves and each other, watching the intense boxing scenes in the movie, many viewers are still shocked. Fight so hard, is it really not going to happen? In fact, boxing is a very dangerous and ferocious sport, and injuries in the ring are not too common, and it is not uncommon to die. Not to mention, Kazuki Anaguchi, Japan's bantamweight professional boxer, was beaten into a meningeal hematoma during a professional boxing match in Tokyo at the end of last year, and he was in a coma after emergency surgery, and finally died on February 2 this year. At that time, Kazuki Anaguchi did not show any obvious abnormalities in the Circle, he resisted many heavy punches, but after the fight, Anaguchi returned to the corner of the ring on his feet, and began to lose consciousness when he returned to the locker room, and he was immediately taken to the hospital for treatment, and eventually passed away after a coma for several days. 
One of the reasons why boxing can cause so much damage to a fighter is that the puncher throws fast and powerful. In terms of punching speed, Xu Can, a professional boxer in China and a WBA featherweight world boxing champion, once did a small challenge, facing a stainless steel cauldron lid, Xu Can punched continuously, and finally punched 111 punches in 10 seconds. Although the scene of the official match is more complicated, and it is difficult for boxers to punch like this without too much outside interference, it is enough to show how fast boxers can throw their punches. 
As for the punch power, boxers of different weights and genders have different punch power. Taking the well-known UFC strawweight world champion Zhang Weili in recent years as an example, the official shows that she is 163cm tall and weighs 54kg. Other boxers who weigh more or are male will naturally have more power in one punch. When such a fist falls on the face, the opponent's facial expression will be distorted, and the local soft tissues will be contusion and swelling, and some people will have a large swollen bag on the head. 
In fact, this is not serious, such as facial fractures, brain **, and even death. Previously, UFC star Northcutt was beaten by the opponent in a game and suffered 8 fractures in the face, and the operation lasted 9 hours before it ended. 
In slow motion, you can see that the head of the boxer has been pushed to the side by the fist, the muscles are still stopped in place, and the water waves are trembling in the face of the opponent's heavy punches, especially be careful of being punched to the chin, if you are not careful, you may directly "fall to the ground".
The chin is a more fragile part because the nerves and blood vessels near the chin are relatively abundant, and the brain is in a leveraged situation, the jaw is hit, which may not only lead to bleeding, jaw dislocation, loose teeth and loss, but also the brain will also produce violent**, people may have tinnitus, fall and even faint after losing their sense of balance. During the game, many boxers will protect their jaws, and some boxers will usually strengthen their jaw's resistance to blows through various methods, such as British star Anthony Joshua was given the title of "glass chin", and later he was revealed to have specially exercised his chin - biting a weight marked 20kg with his teeth.
It is worth mentioning that the endurance of a professional boxer is quite impressive when it comes to speed and strength. For example, in a boxing match that lasts 12 rounds and lasts 36 minutes, it is normal for a boxer to throw 400 600 punches, 600 800 times is a lot, and in some fights a boxer can punch more than 1,000 times. The aforementioned Xu Can, in the 2019 WBA Featherweight World Champion defense, against Robles III, Xu Can threw 1,562 punches, an average of about 1Punch once in 4 seconds. But perhaps, it is precisely because it is full of challenges and passion that it is more attractive for people to continue to learn, challenge and surpass.