What causes toothache and dry mouth?

The causes of toothache and dry mouth may involve various diseases and factors, mainly including the following: 1. **Oral diseases**: Such as dental caries, pulpitis, and periodontitis. These conditions can cause tooth pain and may also affect saliva secretion, leading to dry mouth. 2. **Systemic diseases**: Such as Sjögren's syndrome and diabetes. These diseases may affect the salivary glands, resulting in reduced saliva production and causing dry mouth. Additionally, patients with diabetes may experience dry mouth due to elevated osmotic pressure in the body. 3. **Lifestyle and environmental factors**: Physiological factors such as prolonged lack of water intake, rapid breathing, and intense physical activity, as well as environmental factors like dry climate and extended exposure to air-conditioned rooms, may also reduce saliva production and lead to dry mouth. If these symptoms occur, it is recommended to seek medical attention promptly so that a doctor can make a diagnosis and provide appropriate treatment based on the specific condition.