Why does your mouth dry out: causes of dryness, bitterness, and white plaque

Dry mouth: what it is and why it occurs

Saliva is 99% water, but the remaining 1% is enzymes and minerals that support the health of enamel. Without proper hydration, the risk of bacterial infections and tooth decay increases several times. Statistics show that chronic dry mouth is observed in 20-30% of the adult population of the world, especially among the elderly.

Xerostomia occurs when the salivary glands stop producing enough secretion to moisturize the mucous membrane. Saliva performs a critically important role: it neutralizes acids, helps digestion, and protects teeth from caries. In addition to protecting enamel, saliva performs the function of primary cleansing of the oral cavity from food debris and waste products of microorganisms. When the secretion rate falls below a critical level, the acid-base balance (pH) is disturbed, which creates favorable conditions for demineralization of teeth and the rapid accumulation of soft bacterial plaque. This can lead to the development of gingivitis and periodontitis in the early stages of moisture deficiency.

The main causes of dry mouth and throat

Many factors can provoke the feeling that «everything is dry»: from lifestyle to serious pathologies. It is important to distinguish temporary factors from chronic conditions that require medical intervention. When a patient asks why his mouth is dry, the first thing to do is to check the list of medications and diet. Often the problem lies in simple things:

• Taking medications: more than 500 types of drugs (antihistamines, antidepressants, blood pressure medications) cause a side effect in the form of xerostomia.
• Dehydration: insufficient consumption of clean water during the day.
• Bad habits: smoking and drinking alcohol aggressively dry out the mucous membrane.
• Stress: during nervous tension, saliva production is blocked by the nervous system.

Often the causes are related to breathing, not dentistry. If the septum is deviated or allergic rhinitis, a person is forced to breathe through the mouth, which leads to the fact that the throat dries out very quickly. Also, a burning sensation in the throat can be a symptom of viral infections or tonsillitis. Also, a prolonged lack of sufficient saliva complicates not only the process of chewing and swallowing food, but also articulation during speech. Patients with a chronic form often have increased sensitivity of the mucous membrane to temperature and chemical stimuli. The lack of immunoglobulins and lysozyme contained in the secretion of the salivary glands deprives the oral cavity of its natural antibacterial barrier, making it vulnerable to fungal infections.

Dry mouth at night: why does it happen

Nocturnal xerostomia is one of the most common complaints of patients, which significantly spoils the quality of sleep. This is a condition when a person wakes up due to a lack of saliva, which leads to excessive dryness of the mucous membrane and sticking of the inner surface of the lips to the teeth. The cause of dry mouth at night usually lies in the decrease in salivary gland activity during sleep, which is a natural process. However, there are factors that aggravate this condition to a critical level:

• Mouth breathing: due to nasal congestion or habit.
• Snoring and apnea: breathing stops during sleep force the mucous membrane to intensively evaporate moisture.
• Dry air in the bedroom: especially during the heating season, when humidity drops below 30%.

To minimize negative consequences, it is necessary to ensure free nasal breathing and maintain an optimal microclimate in the room.

If hygiene measures do not bring relief, and dryness is accompanied by pain or bleeding gums, this indicates the need to review the state of health at the systemic level.

White tongue, bitterness and dry mouth as symptoms of diseases

Sometimes xerostomia is accompanied by specific signs, such as plaque and a change in taste sensations. In such cases, the cause may be in the gastrointestinal tract or endocrine system. The combination of symptoms such as bitterness in the mouth, white coating on the tongue, often indicates problems with the liver or gallbladder.

• Bitterness and dryness: may indicate a backflow of bile into the stomach (reflux).
• Nausea and dryness: characteristic signs of gastritis and even early pregnancy.
• Dryness and weakness: along with constant thirst, these are classic symptoms of diabetes.
• White tongue and dryness: often a sign of candidiasis (thrush) of the oral cavity, which develops against the background of reduced immunity.

Statistics show that in 80% of people with type 2 diabetes, this is one of the first noticeable symptoms.

What to do if your mouth is dry: treatment and recommendations

When your mouth is constantly dry, treatment should begin with diagnosing the root cause. You should not immediately buy pills for bitterness in the mouth, because self-medication can only mask a serious problem. A few steps that will help before a visit to the doctor:

• Drink water: in small sips, but often.
• Stimulate salivation: sugar-free chewing gum or xylitol candies work well.
• Review hygiene: use alcohol-free mouthwashes, as alcohol dries out tissues even more.
• Use humidifiers, keep the humidity level in the range of 40–60%.

Remember, if symptoms last more than two weeks without apparent reasons, this is a direct reason to consult a specialist.

The first step in solving the problem is a professional consultation with a dentist, during which the specialist will examine the mucous membrane and help establish the exact cause of salivary gland dysfunction. Qualified doctors will help determine why your mouth is dry in a particular case and prescribe effective therapy.