You should get a consultation for physical examination.

Avoid fried and spicy food Water intake more Do connect and consult

Likely having a nose block, as a result mouth breathing causes dryness of mouth.

Likely having nose block ,hence breathing through mouth causing dryness of mouth.

Hello, it is common for elderly diabetic patients to face this 'Dry Mouth-Mouth Breathing' cycle. In this case, diabetes and age reduce natural saliva, and the difficulty in nose breathing forces him to breathe through his mouth, which dries it out completely and disturbs his sleep. ​1. Address the Nasal Obstruction (Primary Goal) If he cannot breathe through his nose, he will always breathe through his mouth. ​Saline Nasal Spray/Drops: Use 2 drops in each nostril 3–4 times a day. This helps clear the passages and moisturizes the nasal lining without affecting blood sugar. ​Steam Inhalation: 5–10 minutes before bed can help open the nasal airway. ​Sleeping Position: Using an extra pillow to keep the head slightly elevated can reduce nasal congestion at night. ​2. Manage the Dry Mouth (Xerostomia) ​Sip Water Frequently: Keep a bottle/glass of water by his bedside. Small, frequent sips are better than large amounts at once. ​Sugar-Free Stimulants: Sucking on sugar-free lemon drops or chewing sugar-free gum can help stimulate the salivary glands. (Ensure they are specifically 'Sugar-Free' to protect his diabetic status). ​Biotene / Saliva Substitutes: You can use over-the-counter dry mouth gels or sprays (like Biotene) before he goes to sleep to coat the mouth and keep it moist for longer. ​Avoid Alcohol-based Mouthwash: These significantly worsen dryness. Switch to a specialized 'Dry Mouth' or alcohol-free mouthwash if needed. ​3. Environmental & Health Checks ​Humidifier: Using a cool-mist humidifier in his bedroom at night adds moisture to the air he is breathing. ​Blood Sugar Control: Ensure his blood glucose is well-managed; high sugar levels are a direct cause of increased thirst and dry mouth. ​Medication Review: Some medications for blood pressure or other age-related issues cause dry mouth. Please consult his physician to see if any of his current medicines have 'Xerostomia' as a side effect. ​Recommendation: I suggest starting with Saline Nasal Drops and an OTC Dry Mouth Gel tonight. If the nasal blockage persists, an ENT specialist should check for structural issues like polyps or a deviated septum.

Keep both lips aline apply a paper adhesive in parallel  after joining lips. IT HELPS  IN NASAL BREATHING WHICH IS ONLY ADVISABLE OTHERWISE HE SUFFER LATER AS GIT COMPLAINTS. MOUTH BREATHING  IS NOT ADVISABLE N THAN  MOUTH REMAIN DRY.NO SOLUTION AT ALL.

Is the patient obese as well? He will have to try breathing through nose . A proper examination of the nose would be beneficial to see if there is any obstruction For now make sure to keep the patient hydrated Also make sure to check the kidney function so as not to cause fluid overload in the patient . If it is disturbing sleep , it is recommended to take a consultation. Take some saline nasal spray for now.

Drink plenty of water.and Maintain sugar levels.

The dryness in the mouth is happening mainly because he is breathing through his mouth instead of his nose. This is common at his age and can also be worse in diabetes, especially if the nose is blocked or sugar levels are not well controlled.

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Needs evaluation

Can help you, kindly consult and provide detailed history for proper diagnosis and further management

Need a few more details please consult for further evaluation and treatment

Weight reduction

Do consult

Encourage nasal breathing (treat nasal blockage—steam inhalation, saline drops).Keep well hydrated.Use a humidifier at night. Sugar-free lozenges or saliva substitutes for dryness Maintain good oral hygiene Check/Review: Blood sugar control Medications (some cause dry mouth) ENT evaluation if nasal blockage persists

Take 1 tsf honey in one glass lukewarm water and drink