Young parents, have you ever been concerned about your child falling? Children often fall while playing or running, resulting in injuries to the jaw and chin. The symptoms may not be obvious at the time. Sometimes the skin at the chin is bumped and the wound is simply stitched up during a hospital visit. Thereafter, neither the parents nor the doctor observed the child’s mouth opening. Sometimes, the child’s mouth would not open and the parents would not pay attention to it because they thought it was because of the chin bruise. However, after six months or a year, the child’s mouth became smaller and smaller. At this point, parents are anxious. Unfortunately, it is too late! Injuries to the chin chin can easily be accompanied by injuries to the temporomandibular joints. The temporomandibular joint is located in the bilateral preauricular area and is responsible for the movement of the jaw bone. A problem with the temporomandibular joint can cause abnormalities in the movement of the mandible, such as restricted mouth opening, painful mouth opening or popping, etc. Injury to the temporomandibular joint caused by injury to the jaw and chin, in the milder cases, there is intra-articular bleeding and edema, resulting in temporary restriction of mouth opening, which can be recovered by resting the joint and taking some anti-inflammatory drugs within 2 weeks after the injury, and will not cause long-term mouth opening difficulties. A severe jaw fall can directly cause a fracture of the temporomandibular joint (condylar fracture). The condyle is the main growth and development center of the mandible, and its injury will bring more serious adverse effects to the child, such as joint ankylosis, which manifests as progressive mouth opening restriction and difficulty in opening the mouth, resulting in difficulty in feeding the child, and only fluid or soft food can be eaten, and the amount of food is reduced, which affects the growth and development of the child; the lower facial developmental disorder is deformed, and the deformity becomes more and more obvious as the age increases, and the face is asymmetrical on both sides, and the facial shape changes. The chin is skewed, in the form of deviated jaw, or bilateral mandibular development disorder, lower jaw retraction, in the form of small jaw deformity, snoring at night, hypoxemia, long-term oxygen deprivation; misalignment of bite relationship, dental arch becomes small and narrow, lower front teeth tilted to the lip side in a fan-shaped separation, etc. So how to avoid the occurrence of temporomandibular joint ankylosis? Doctors urge parents to pay attention to children’s falls. Don’t forget to go to the hospital for X-rays or CT to rule out fractures when a child has a chin injury. Nothing is more important than your child’s physical health. Most condylar fractures can be treated conservatively. Regular conservative treatment and compliance with good follow-up are the keys to good outcomes. Conservative treatment includes wearing a doctor-made jaw pad, traction, watching the diet, mouth opening training, and regular follow-up visits. So please don’t take your child’s fall lightly, and prompt medical attention and treatment will save you a lot of trouble in the future. Recently, I met a young patient, a 6-year-old beauty, who had a bump on her chin a year ago. It was only six months later that she found that she could not open her mouth. After taking a film in my clinic, I found that there was a fracture of the condyle on one side, and after the fracture, joint ankylosis occurred. When I analyzed the condition during the consultation, I told the resident that most of the joint ankylosis is caused by joint injury. The incidence of TMJ ankylosis in developed countries is very low, while developing countries have a high incidence, which is related to the importance doctors and families place on TMJ injuries. Most of the condylar fractures in children can be treated non-operatively to achieve better results. In developed countries, the non-operative treatment is better and the family’s compliance is better, so the chance of joint ankylosis is lower; while in developing countries, the family’s compliance is poor, and more importantly, some doctors think that conservative treatment means no treatment and do not pay attention to the patient’s follow-up, which results in missed treatment and joint ankylosis. As a doctor, it is painful to encounter such a situation. I hope to write the above words in order to warn myself and others.