I have astam problem now I can't sleep my maoth is...

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What are the causes of dry mouth?

1. The most common cause is dehydration
2. Smoking and alcohol
3. Different drugs like pain medications and antidepression medications
4. Diabetes
5. Anemia
6. Hyperventilation
7. Sjogren syndrome
8. Anxiety
9. Salivary gland problems
10. Enlarged adenoids
11. Chemotherapy

What are the investigations?

1. Physical examination
2. Blood test (CBC)
3. Tests for different diseases like: Diabetes, Sjogren's syndrome. 
4. Imaging for salivary glands

How to prevent and treat?

1. Drinking good amounts of water
2. Oral care like antiseptic mouthwash and moistureizers
3. Stop smoking and alcohol
4. Stop or change drugs that cause dryness of mouth
5. Drugs that increase salivation like Pilocarpine
6. Dental care

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Kind Regards