What should parents do if they find that their child is always breathing with his mouth open? First of all, go to the ENT department of a regular hospital. The ENT doctor will examine the child’s tonsils, adenoids, nasal cavity and other parts and do the necessary treatment. If it is considered to be caused by rhinitis or sinusitis, medication can be chosen, and if it is considered to be caused by enlarged tonsils and adenoids, selective surgery can be performed to remove them. At the same time, you should encourage your child to exercise regularly in life to enhance resistance. If you have a cold or rhinitis attack, blow your nose dry gently to form the habit of nasal ventilation, some children are used to having snot in their nose he will form the habit of mouth breathing, while also doing warm saline nose wash. Then go to the pediatric dentist, the pediatric dentist will give a mouth breathing blocker. It is a progressive orthotic device to correct mouth breathing habits. It can gradually reduce the mouth breathing habit, and at the same time with the lip muscle training can greatly improve the mouth breathing habit. If the nose function is not used, this function will be used in and out, if you keep breathing through the nose, the breathing function of the nose will gradually increase.