Teachers are the ones who transmit knowledge to students through language. They often need to speak loudly and for a long time, and if they use their voices improperly, they are prone to voice disorders. It is important for teachers to protect their voices. There are two key parts of human pronunciation, one is the vibration of the vocal folds and the other is the resonance of the vocal tract. If the vocal folds vibrate too loudly or improperly, the process of kneading will cause damage to the vocal folds. The response of the vocal folds to the rubbing is also a very important factor in determining damage, and this depends on the physical qualities of the individual. It is often thought that there is a definite correlation between vocal cord damage and the intensity with which it occurs, but this is not the case. Opera singers can sing for hours in the theater without their voices becoming muffled. Therefore, proper and skillful articulation is the key to protecting your voice, which maximizes vocal efficiency and makes your voice loud and long-lasting without damage. Scientific research shows that excessive vocal fold closure and excessive subglottal compression can lead to vocal fold damage; proper application of vocal tract resonance is also a very important part of voice protection. How to avoid the above-mentioned unfavorable factors and play favorable factors is the key to voice health care. 2.How to check your voice What should you do if you feel you have a problem with your voice? The right way should be to let a professional doctor to determine the problem of voice occurrence, focusing on checking the vocal cords. At present, there are advanced non-invasive examination methods in China, such as hard tube dynamic laryngoscopy which can enlarge the image of vocal folds and display it on the screen. If supplemented with dynamic light source, you can also see the slow motion video of vocal folds vibration, which is helpful to find out the early tiny lesions. Computerized professional measuring equipment can measure the degree of hoarseness of vocalization and the efficiency of laryngeal vocalization. All these examination procedures are easy, fast, non-invasive and basically painless for patients. 3. Common voice disorders among teachers Some teachers mentioned during the consultation that voice disorders occur acutely after recent excessive use of voice, which is often caused by acute inflammatory edema of the vocal cords. In other cases, teachers who have been suffering from voice disorders for some time and have recently shown signs of aggravation may have developed vocal fold hypertrophy, polyps or nodules. In rare cases, white spots on the vocal cords may be found, with the possibility of developing into tumors without treatment. These cases often cannot be reversed by medication alone and often require surgery. 4.Vocal health care and common methods Voice protection should start from health care and actively prevent the occurrence of voice disorders. As long as you can pay attention to some of the following details in your daily life, it will be beneficial to your voice health. 1, dietary habits: many foods cause reflux pharyngitis from different aspects and thus affect the voice. For example, coffee, alcohol, chocolate and mint can weaken the muscles of the lower esophageal sphincter, citrus fruits, kiwi, pineapple, tomatoes and other spicy foods directly stimulate the mucous membrane layer of the larynx, and carbonated beverages such as soda and beer directly bring acidic stomach contents directly to the larynx and directly stimulate the mucous membrane of the larynx. These foods should be minimized or avoided. 2, lifestyle changes: do not exercise or sing within two hours after meals, these activities will increase the pressure of the abdomen, and lead to the stomach contents directly into the throat. Avoid over-eating, change three meals a day to a small number of meals. Do not eat within 3 hours before bedtime, and can properly pad the head of the bed, which is conducive to retaining the stomach contents better in the stomach and not reflux. 3.Change the bad habits of using voice: shouting or screaming, speaking in abnormal or uncomfortable low or high tones, vocalizing when sneezing or yawning, clearing your throat continuously, whispering loudly or whispering for a long time, talking with your head and neck on the phone. 4. Develop a good habit of using your voice: speak in a tone you feel comfortable with. 5. Quit smoking because it can stimulate the mucous membrane of the vocal cords. Keep a happy mood, avoid stress, pay attention to rest and strengthen exercise. 5.New developments in voice science at home and abroad Nowadays, the development of voice treatment at home and abroad is mainly reflected in behavioral treatment and advanced microsurgery and minimally invasive treatment. 1.Behavioral therapy: Vocal training and the concept of speech therapist are not popular in China. Everyone is pronouncing their voice, but their pronunciation skills and habits are very different. In order to achieve the best pronunciation effect and efficiency, vocal and speech training is the main method. It is just like running, everyone can run, but training without training has a great impact on the speed. I believe that Liu Xiang’s performance before and after receiving professional hurdle training is certainly a world of difference. But nowadays, in China, generally only professional people with voice may generally receive vocal and speech training, such as: singers, actors and so on. And foreign countries use voice training as the main method to treat voice diseases. In the United States, for example, there are about 5,000 speech therapists who specialize in voice therapy. In the future, teachers should also be the main target of voice training and speech correction so that teachers can get better voice protection. 2. Microsurgery: Microsurgery allows the vocal fold surgery to be performed under a microscope in a more delicate manner, thus maximizing the removal of the diseased tissue while preserving the structural and functional integrity of the vocal folds, which is more conducive to the recovery of the patient’s voice after surgery. 3. Minimally invasive treatment: The concept of minimally invasive treatment allows patients to use advanced surgical instruments such as electronic laryngoscopes and laser knives under local anesthesia in the future to perform surgeries that used to be done in the hospital under general anesthesia, reducing the pain of patients and improving the efficiency of treatment. This is the future direction of voice surgery.