Teachers need to speak all year round because of their occupational factors, so it is easy to have some lesions such as acute and chronic laryngitis, vocal cord nodules, vocal cord polyps, and even vocal cord leukoplakia. To protect your voice, you can do the following: 1. Control the time of speaking, try not to speak more than three hours a day, and try not to speak for more than one and a half hours each time. The teacher should try not to speak loudly, especially not to shout or scream, and try to keep a calm voice when speaking. 3. The teacher should drink more warm water and eat more vegetables and fruits such as pears and grapefruit. If you find that you have a dumb voice, sore throat and so on, go to the ENT clinic for treatment as soon as possible, you can do nebulization treatment. You can also take some antibiotics and traditional Chinese medicine for laryngitis, such as Huang’s Sound Pills and Golden Voice Capsules. If vocal cord polyps are found, surgery is recommended as soon as possible.