There will be the following symptoms during teething: 1. Temporary gingivitis: When the milk molar and the first permanent molar erupt, temporary gingivitis can be formed, with congestion and swelling around the crown, producing an unusual sensation, making children like to chew on fingers or toys, touch the mucosa and be prone to infection. 2. Mucosal swelling: Local swelling of the mucosa covering the crown can be seen before the eruption of the milk molar, showing a greenish-purple color and forming an eruptive cyst. 3. Temporary crowding: During the replacement of permanent teeth, temporary crowding can occur because the width of the crown of permanent teeth is greater than that of the milk teeth, and the teeth will gradually align as the jaws continue to develop. 4. Saliva overflow: When infants and young children erupt, the stimulation of teething can cause the parotid gland and other glands to secrete a lot of mucus, and because the child’s nervous system is not perfect and cannot control the swallowing action, it can cause saliva overflow and cause eczema around the mouth. Eczema, etc.