Why is my mouth dry even though i drink a lot of water?

If you’ve ever found yourself pondering why your mouth still feels dry despite drinking 8+ glasses of water a day, you may be experiencing a common condition known as xerostomia, or dry mouth. While it may initially seem like a harmless symptom, those who suffer from chronic dry mouth understand the disruptive impact it can have on daily life and the potential health implications it carries.

For those afflicted, the dryness goes beyond a mere sensation of thirst. It’s the discomfort of waking up to lips stuck to teeth and struggling to speak without moisture. No matter how much water is consumed, relief is only temporary, and even swallowing can become a challenge.

Individuals with dry mouth often find themselves frequently drinking water during meals, gradually accepting this as their new normal.

However, the consequences of reduced saliva production are far from benign. Tooth decay becomes more prevalent, cavities form easily, and plaque adheres to teeth with greater ease. Additionally, dry mouth significantly contributes to persistent bad breath, while examinations reveal inflamed and swollen salivary glands.

Dental teams often play a crucial role in identifying dry mouth, as many individuals tend to downplay or overlook its symptoms. By understanding the underlying factors and seeking appropriate treatment, individuals can alleviate the discomfort, protect their oral health, and restore balance to their daily lives.

Why is my mouth dry even though i drink a lot of water

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What are the consequences of a dry mouth?

Saliva serves a vital role in our oral health, extending beyond its role in chewing, tasting, and swallowing food. It acts as a natural defender, maintaining the health of our gums and teeth, and preventing issues such as cavities, infections, and bad breath.

When saliva production decreases, as is the case with dry mouth, the protective mechanisms of the mouth are compromised. Without sufficient saliva, bacterial growth can thrive, increasing the risk of tooth decay and gum disease.

The absence of saliva can also contribute to halitosis, causing persistent bad breath that can be socially distressing. Furthermore, swallowing food becomes more challenging, making mealtime a task rather than an enjoyable experience.

The discomfort and inconvenience of dry mouth can be pervasive, affecting not only oral health but also overall well-being. Here are some signs and symptoms of dry mouth:

Symptoms of Xerostomia

Dry mouth can manifest with a variety of symptoms that many people find to be both uncomfortable and bothersome. They include:

  • Persistent thirst: Individuals with dry mouth often experience an ongoing sensation of thirst, regardless of how much water they drink.
  • Reduced saliva production: A noticeable decrease in saliva, leading to a dry, sticky feeling in the mouth.
  • Difficulty swallowing: Dry mouth can make swallowing food and liquids more challenging and uncomfortable.
  • Dry, cracked lips: The lack of saliva can cause the lips to become dry, cracked, and prone to irritation.
  • Sore or irritated throat: The dryness in the mouth can extend to the throat, causing discomfort, irritation, or a persistent dry cough.
  • Altered sense of taste: Reduced saliva flow can affect the ability to taste food properly, leading to a diminished sense of taste.
  • Bad breath: Insufficient saliva allows bacteria to thrive in the mouth, contributing to persistent bad breath or halitosis.
  • Difficulty speaking: Dry mouth can make speaking difficult, as the tongue and mouth may feel dry, sticky, or uncomfortable.
  • Increased dental problems: Reduced saliva’s protective effects can lead to an increased risk of cavities, gum disease, and tooth decay.
  • Mouth ulcers or sores: Dry mouth can create an environment where mouth ulcers or sores are more likely to develop.
  • Dry nasal passages: The lack of moisture in the mouth may extend to the nasal passages, causing dryness and discomfort.
  • Thick or stringy saliva: Instead of the usual thin and watery consistency, saliva may become thick, sticky, or stringy.
  • Oral thrush (Candida yeast): Dry mouth can create an environment that is more susceptible to fungal infections in the mouth, such as oral thrush (caused by Candida yeast). Normally, saliva helps to keep the mouth clean by washing away bacteria and fungi. However, reduced saliva flow in dry mouth can disrupt this natural defense mechanism, allowing fungal elements to thrive and cause infections.

Causes of dry mouth

You could experience a dry mouth if you’re nervous before making a big presentation, due to overindulging in alcohol, breathing through your mouth, or just because you’re dehydrated. But these causes are usually temporary, and you should feel better after drinking some water.

But there are many other factors that can contribute to xerostomia, including:


Dry mouth is a common side effect for hundreds of medications that block neurotransmitters responsible for producing saliva. Here are some categories of drugs that may be responsible for your persistent dry mouth:

  • Antidepressants: Certain antidepressant medications, such as tricyclic antidepressants and selective serotonin reuptake inhibitors (SSRIs), can cause persistent dry mouth.
  • Antihistamines: Commonly used to treat allergies, antihistamines can reduce saliva production.
  • Diuretics: Diuretic medications, often prescribed for conditions like high blood pressure, tend to increase urine production, which can lead to dehydration and dry mouth.
  • Pain medications: Opioids and some nonsteroidal anti-inflammatory drugs (NSAIDs) can cause dry mouth as a side effect.
  • Other medications: Numerous other medications, including those for high blood pressure, asthma, Parkinson’s disease, and urinary incontinence, may contribute to dry mouth.

Health conditions

Prolonged dry mouth could also be a symptom of a condition you’re suffering from, such as:

  • Sjögren’s syndrome: An autoimmune disorder where the immune system mistakenly attacks the body’s moisture-producing glands, leading to dry mouth and dry eyes.
  • Diabetes: Poorly controlled diabetes can cause dry mouth due to increased blood sugar levels and associated dehydration.
  • Sleep apnea: This is a sleep disorder characterized by breathing disruptions that can lead to decreased airflow and oxygen levels, resulting in mouth breathing and snoring. This can in turn cause dryness of the oral tissues (mouth, throat, and tongue as air passes over them) and contribute to dry mouth symptoms.
  • HIV/AIDS: The virus and associated medications can contribute to dry mouth.
  • Alzheimer’s disease: Individuals with Alzheimer’s may experience dry mouth as the disease progresses.
  • Radiation therapy: Radiation treatment for head and neck cancers can damage salivary glands, causing thick saliva and reduced saliva production, ultimately leading to chronic dry mouth.


Since alcohol is a diuretic, it increases urine production which leads to dehydration. Alcohol also has a drying effect on tissues in the body, including the mouth. It can reduce saliva production and cause a feeling of dryness and stickiness in the mouth. Additionally, alcohol can have a numbing effect on the nerves that regulate saliva production, further contributing to dry mouth symptoms.

That said, the degree of dry mouth experienced after consuming alcohol can vary depending on factors such as the amount of alcohol consumed, the frequency of consumption, and individual differences in hydration levels. Staying hydrated by drinking water and avoiding excessive alcohol consumption can help reduce the risk of experiencing dry mouth symptoms.

Smoking or chewing tobacco

Tobacco use, whether through smoking or chewing tobacco, can cause dry mouth in various ways:

  • Vasoconstriction – The chemicals in tobacco, particularly nicotine, can cause blood vessels to constrict or narrow. This constriction can affect the blood flow to the salivary glands, leading to reduced saliva production and dry mouth.
  • Irritation of Oral Tissues – Smoking or chewing tobacco can irritate the oral tissues, including the gums, tongue, and throat. This irritation can trigger an inflammatory response and disrupt the normal functioning of the salivary glands, resulting in dry mouth.
  • Increased Thirst – Tobacco use can also contribute to increased thirst. Smoking can cause dehydration, which prompts the body to seek more fluids. This increased thirst may make the mouth feel dry.

Both smoking and smokeless tobacco can have these effects on saliva production and oral health. Quitting tobacco use is beneficial not only for reducing dry mouth but also for improving overall oral health and reducing the risk of various health conditions. Seeking support from healthcare professionals or cessation programs can be helpful for those looking to quit tobacco.

Other possible causes

Dehydration – Insufficient fluid intake or excessive sweating without proper hydration can result in temporary dry mouth.

Mouth breathing – Breathing predominantly through the mouth, due to nasal congestion or habit, can cause dry mouth.

Nerve damage – Injuries or surgeries that affect the nerves controlling saliva production can lead to chronic dry mouth.


The duration of symptoms can vary depending on individual circumstances and factors. If you are experiencing persistent dry mouth, it is advisable to consult with a healthcare professional to determine the underlying cause and appropriate treatment options.

Diagnosis of Dry mouth

When diagnosing dry mouth, healthcare professionals typically conduct a thorough examination of the patient’s mouth and review their medical history. This initial assessment helps identify any underlying factors contributing to dry mouth symptoms.

In some cases, further diagnostic tests may be recommended to gather more information. These may include:

Medical History and Clinical Examination

The healthcare provider will discuss the patient’s symptoms, medical history, and any medications they may be taking. They will visually inspect the oral cavity, looking for signs of dryness or oral mucosa abnormalities.

Blood Tests

Blood tests can help identify any underlying health conditions or deficiencies that may contribute to dry mouth. These tests may include checking for autoimmune disorders, hormonal imbalances, or specific markers related to salivary gland function.

Imaging Scans

Imaging techniques like sialography may be used to visualize the salivary glands and ducts. This procedure involves injecting a contrast material and taking X-rays or other imaging scans to detect any blockages, stones, or abnormalities in the salivary glands.


Sialometry is a simple test to measure saliva flow rate. Collection devices are placed over the openings of the saliva glands, and the patient’s saliva production is stimulated, often using citric acid. The amount of saliva produced is then measured and analyzed.


If initial tests and evaluations do not provide a conclusive diagnosis, a biopsy of the salivary gland tissue may be recommended. This procedure involves taking a small sample of tissue from the salivary glands for further examination. Biopsies are particularly useful if there is suspicion of salivary gland tumors or cancers.

Treatment options for dry mouth

When it comes to treating dry mouth, it’s important to address both the underlying causes and the symptoms. Common treatment options include:

Medication Review

If medications are identified as the cause of dry mouth, the healthcare provider may consider adjusting the dosage or switching to an alternative medication that doesn’t have the side effect of dry mouth. In some cases, they may also prescribe medications that help stimulate saliva production.


Staying well-hydrated is essential for managing dry mouth. Drinking plenty of water throughout the day can help alleviate symptoms. It’s important to avoid sugary drinks and caffeinated beverages as they can further contribute to dryness.

Stimulating Saliva Flow

Chewing sugarless gum or sucking on sugarless hard candy can stimulate saliva production. This can provide temporary relief from dry mouth symptoms and help maintain a moist oral environment.

Anti-fungal mouthwash

When selecting a mouthwash to prevent fungal infections, look for those specifically designed for dry mouth or labeled as antifungal, since they contain key ingredients, such as antifungal agents or essential oils (e.g., tea tree oil, thymol), which can help control fungal overgrowth and prevent infections.

Some mouthwashes are specifically formulated to moisturize and lubricate the oral tissues. They can temporarily alleviate the dryness associated with dry mouth and help create a more favorable environment for saliva production. It’s important to follow the instructions provided by the manufacturer and use the mouthwash as directed.

Lifestyle Changes

Avoiding tobacco use and minimizing alcohol consumption can help improve dry mouth symptoms. Tobacco and alcohol can exacerbate dryness and contribute to oral health problems.

Humidifier Use

If dry mouth is worsened by snoring or mouth breathing during sleep, using a bedside humidifier can help add moisture to the air and prevent excessive dryness in the oral cavity.

Saliva Substitutes

Over-the-counter saliva substitutes or artificial saliva products are available and can provide temporary relief by moistening the mouth. These products help lubricate the oral tissues and alleviate discomfort associated with dry mouth.

Final thoughts

In addition to the suggestions mentioned above, maintaining good oral hygiene practices, including regular brushing with a fluoride toothpaste and flossing, is crucial for preventing tooth decay and other oral health issues when you have dry mouth.

It’s important to remember that persistent dry mouth should be discussed with a healthcare provider to explore further treatment options tailored to the individual’s specific needs.


  • Editorial team

    A team comprising oral health care professionals, researchers, and professional Writers, striving to impart you with the knowledge to improve your oral health, and that of your loved ones. 

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