Gums that are not swollen or red but have a toothache may be caused by conditions such as pulpitis, dentin hypersensitivity, occlusal trauma, and fissured teeth. 1. Pulpitis: Pulpitis is an infectious disease in the oral cavity, and most of it is caused by the lack of active treatment after tooth decay, which leads to infection of the pulp tissue. Teeth will be painful due to inflammation stimulation, but when the symptoms are mild, there will be no redness or swelling of the gums. 2. Dentin allergy: Dentin allergy is mostly related to enamel defects, excessive wear and tear of teeth, fractured teeth, etc. When the affected teeth are stimulated by the outside world, the symptoms of tooth sensitivity and pain will appear. 3. Occlusal trauma, dental occult fracture: when the teeth are subjected to excessive biting force, resulting in occlusal trauma, dental occult fracture, the symptoms of occlusal pain will occur, but not accompanied by swelling or redness. It is recommended that any abnormalities in the teeth should go to the dental hospital in time in order to find out the specific cause of the disease and actively treat it to avoid delaying the condition.