It is not necessary to rinse your mouth again with water after using mouthwash. Mouthwash generally contains antibacterial or bacteriostatic substances, which can play a role in removing bad breath, sterilization and bacteriostasis, if you rinse your mouth with water immediately after rinsing with mouthwash, it will affect the inhibitory effect of the mouthwash on the oral bacteria, affecting the therapeutic effect of the mouthwash. The oral cavity itself is a bacterial environment, just when the pathogenic bacteria multiply more disease will occur. Since mouthwash is generally a broad-spectrum bactericidal and bacteriostatic agent, it cannot be used for a long period of time, otherwise it is easy to cause dysbiosis, affecting the presence of normal flora in the oral cavity. For the average healthy person, every day after getting up and before going to bed, using toothpaste containing fluoride can be brushed thoroughly, there is no need to use mouthwash for a long time.