Why do cavities hurt at night?
Disease description:
My child's tooth decay always hurts at night. He doesn't eat sweets, and he already rinses his mouth before going to bed. Why does tooth decay cause pain at night?
Doctor's answer (1)
Dr. Guo Huijie
The main causes of toothache at night include the following:
1. **Pulpitis**: When a cavity reaches deep into the pulp chamber, bacteria and their toxins may invade the pulp tissue, causing inflammation. At night, saliva secretion decreases and oral pH drops, creating favorable conditions for bacterial proliferation and acid production, which can intensify the pain.
2. **Secondary infection**: If dental caries are not treated in a timely manner, they may lead to pulp infection and subsequent pain. During nighttime, lower temperatures cause vasoconstriction and slower blood flow, which hinders the metabolism and elimination of inflammatory factors, thus exacerbating the pain.
3. **Tooth sensitivity**: Damage or wear of the enamel exposes the dentin, causing sensitivity. At night, reduced saliva results in a more acidic oral environment, which stimulates the nerve fibers within the dentinal tubules, causing pain.
4. **Periodontitis and gingivitis**: These inflammatory conditions may worsen at night due to increased local blood circulation and heightened activity of pathogenic bacteria, leading to more intense pain.
To relieve this pain, patients are advised to seek timely medical attention, obtain an accurate diagnosis, and receive targeted treatment based on the specific underlying cause.
