입마름 원인과 집에서 할 수 있는 완화 방법

You wake up with your tongue stuck to the roof of your mouth, and after a few minutes of talking you are reaching for water — that is what dry mouth feels like. An occasional dry spell is normal, but if it keeps happening it is worth finding the cause, because saliva is one of your teeth's most important defences.

What is dry mouth, and why does saliva matter?

Dry mouth (medical name: xerostomia) is the feeling of not having enough saliva. The American Dental Association (ADA) describes it as a subjective sensation: some people have measurably normal saliva flow, while others genuinely produce less.

According to the ADA's MouthHealthy site, saliva washes away food, neutralises acids made by bacteria and contains substances that help fight microbes; NIDCR adds that saliva also supplies minerals that let enamel repair itself. Without enough saliva, teeth lose this natural protection.

A systematic review by Agostini and colleagues (2018) pooled 29 epidemiological studies and estimated that about 22% of people have dry mouth, with higher rates in studies of older adults only; the authors also noted that current measurement methods may over- or underestimate it. PubMed

Common causes of dry mouth

• Medicines: the most common cause. The US National Institute of Dental and Craniofacial Research (NIDCR) says hundreds of medicines can make the salivary glands produce less saliva, such as drugs for blood pressure, depression and bladder control. The ADA counts 106 medications with strong or moderate evidence of causing salivary gland dysfunction, and risk rises with more than four daily prescription drugs.
• Mouth breathing during sleep: from habit, snoring, a blocked nose or sleep apnoea. Vinmec (a Vietnamese hospital source) puts this first on its list of nine reasons for waking up with a dry mouth.
• Age: the ADA reports dry mouth in about 30% of people over 65 and up to 40% of those over 80; Cleveland Clinic explains that older adults are more likely to have conditions or take medicines that cause it. Still, as NIDCR puts it, "Dry mouth is not a normal part of aging."
• Medical conditions: diabetes, Sjögren's disease (an autoimmune condition that attacks moisture-producing glands) and HIV/AIDS (NIDCR). If you live with diabetes, see our article on diabetes and oral health.
• Cancer treatment: radiation to the head and neck can damage the salivary glands, and chemotherapy can make saliva thicker (NIDCR).
• Habits: smoking, drinking alcohol and not drinking enough water. Cleveland Clinic also lists sleeping with your mouth open; Vinmec notes that alcohol-based mouthwash can make dryness worse.

How does dry mouth affect your teeth and gums?

According to NIDCR, dry mouth raises the risk of tooth decay and fungal infections, because there is not enough saliva to keep harmful germs in check. Cleveland Clinic adds gum disease and oral thrush. The ADA notes that cavities in people with dry mouth often appear on the roots, near the gumline and on the tips of the teeth.

People may also have trouble chewing, swallowing, tasting or speaking, along with mouth sores and bad breath (NIDCR). Bad breath has many other causes, summarised in our article on causes of bad breath.

How to ease dry mouth at home

The steps below can make you more comfortable, but they do not replace dealing with the cause.

1. Sip water throughout the day: take frequent sips of water or sugar-free drinks, including during meals (NIDCR). Water brings temporary relief but cannot fully replace saliva (Cleveland Clinic).
2. Chew sugar-free gum: sugar-free gum or hard candy stimulates the salivary glands; products with xylitol may help prevent cavities (NIDCR).
3. Use a humidifier while you sleep: run a humidifier in the bedroom at night (NIDCR, Vinmec), especially if you tend to breathe through your mouth.
4. Ask your doctor about your medicines: if a drug may be to blame, your doctor may consider switching it or adjusting the dose. Never stop a medicine on your own (Cleveland Clinic).

In addition, avoid tobacco and alcohol and limit caffeine (NIDCR). You can ask a dentist or pharmacist about artificial saliva; the ADA notes these products give temporary relief and do not cure dry mouth.

On the evidence: a Cochrane review by Furness and colleagues (2011) of 36 trials with 1,597 participants found no strong evidence that any topical therapy (gum, sprays, gels, mouthwashes and so on) clearly relieves the feeling of dry mouth. Chewing gum increased saliva in people whose glands still work, but it was neither better nor worse than saliva substitutes. The review is fairly old and many trials were at high risk of bias. PubMed

Gentle oral hygiene when your mouth is dry

With less saliva, cleaning your teeth matters even more — but go gently, because dry tissues get sore easily. The ADA advises brushing gently at least twice a day with fluoride toothpaste (see our article on fluoride toothpaste); your dentist may also prescribe a high-strength fluoride gel or apply fluoride varnish. Vinmec recommends a soft-bristled toothbrush and daily cleaning between the teeth.

When should you see a doctor?

• Dry mouth that persists and does not improve even when you drink enough. Cleveland Clinic notes that early treatment lowers the risk of cavities and gum disease.
• Dry mouth that started after a new medicine.
• Dry mouth together with dry eyes, since Sjögren's affects the glands around both the mouth and the eyes (Vinmec).
• A dry mouth every morning plus snoring, if you suspect sleep apnoea.
• Mouth sores, difficulty swallowing or new cavities appearing again and again.

The ADA recommends that people with dry mouth see a dentist at least twice a year.

Dental care devices that suit a dry mouth

No device can cure dry mouth. A device can only help you keep your teeth clean more gently while saliva is low:

• M5 electric toothbrush: Sensitive and Gum Care modes alongside Clean and Whitening; 20,000 vibrations per minute; 1,200 mAh battery; IPX7 waterproof.
• M159 water flosser: 4 modes, including a Soft mode to start with when your gums feel tender; 40–130 PSI range; weighs 256 g; 300 ml tank. Use plain clean water and do not add alcohol-based mouthwash.

You can compare specifications or contact Inmax for advice.

Frequently asked questions

Should I worry about waking up with a dry mouth?

The usual causes are mouth breathing or snoring during sleep. If it happens often and is severe, get checked for a blocked nose or sleep apnoea.

What does xylitol gum do?

Chewing sugar-free gum stimulates saliva, and gum with xylitol may help prevent cavities. Avoid sugary sweets.

Can I use a water flosser if I have dry mouth?

Yes, if you start on a gentle setting. It only helps clean between teeth; it does not increase saliva.

The information above is for reference only; if dry mouth lasts, let a doctor look for the cause — this article does not replace your doctor's advice.