Understanding Dry Mouth (Xerostomia)
Dry mouth, medically termed xerostomia, occurs when salivary glands produce insufficient saliva. While occasional dryness is normal, particularly when nervous or dehydrated, persistent xerostomia creates significant oral health challenges. Saliva plays critical roles in protecting teeth and maintaining oral health, so its absence creates multiple problems.
Saliva cleanses your mouth by washing away food debris and bacteria. It contains enzymes that begin breaking down food and proteins that fight bacterial infection. Saliva neutralizes acids protecting enamel from erosion. It aids swallowing and digestion. Without adequate saliva, you're vulnerable to rapid decay, infection, and difficulty eating and speaking.
Causes of Dry Mouth
Medications are the most common cause of dry mouth in adults. Hundreds of medications can reduce saliva production, including antihistamines, decongestants, antidepressants, antipsychotics, blood pressure medications, and pain medications. Some medications cause dry mouth as a primary side effect while others are incidental. Chemotherapy drugs and radiation therapy for cancer cause severe xerostomia.
Sjögren's syndrome is an autoimmune disorder attacking saliva and tear glands, causing severe dry mouth and dry eyes. Other autoimmune conditions including rheumatoid arthritis and lupus can reduce saliva. Diabetes, particularly poorly controlled diabetes, affects salivary flow.
Dehydration from inadequate water intake or excessive fluid loss contributes to dry mouth. Age-related changes in salivary gland function cause increased dryness in older adults. Additionally, stress and anxiety can temporarily reduce saliva production.
Health Consequences of Dry Mouth
Without saliva's cleansing action, cavity rates increase dramatically. People with xerostomia often develop multiple cavities simultaneously, even those with excellent past dental history. Cavities develop rapidly and can progress deep into the tooth structure.
Dry mouth increases oral infection risk, particularly thrush. Chewing and swallowing become difficult without saliva. Taste changes occur as saliva's chemical components necessary for taste perception decrease. Speech can be affected, particularly for people with severe xerostomia. Denture wearing becomes extremely uncomfortable.
Treatment Strategies
The first step is addressing the underlying cause if possible. Ask your physician if medications causing dry mouth can be replaced with alternatives without this side effect. Some medications must be continued despite causing xerostomia, but others have suitable substitutes.
Increase water consumption throughout the day. Carry a water bottle and sip constantly. Avoid caffeinated and alcoholic beverages, which promote dehydration. Humidify your sleeping environment with a room humidifier, as dry indoor air worsens symptoms overnight.
Saliva Stimulants and Substitutes
Sugar-free lozenges and gum stimulate remaining salivary gland function. Xylitol-based products are preferred because xylitol also protects against cavities. Suck on lozenges throughout the day to maintain constant saliva production stimulation.
Artificial saliva products are available over-the-counter, providing temporary moisture relief. These products mimic saliva's functions but don't provide the protective enzymes and proteins natural saliva contains. Use them as needed for comfort.
Prescription Treatments
For severe dry mouth, prescription medications can stimulate saliva production. Pilocarpine (Salagen) and cevimeline (Evoxac) are oral medications that activate salivary glands. These require regular dosing and work better for people with remaining glandular function than for those with completely destroyed glands.
Fluoride treatments become essential for people with dry mouth due to dramatically increased cavity risk. Your dentist may recommend frequent professional fluoride treatments supplemented with high-strength prescription fluoride toothpaste. Some dentists recommend custom gel trays with fluoride for nightly use.
Oral Hygiene Modifications
Excellent oral hygiene is critical for people with dry mouth. Brush more frequently—after every meal and snack with fluoride toothpaste. Floss multiple times daily. Use antimicrobial mouthwash regularly, though avoid alcohol-based rinses that worsen dryness.
Dietary Adjustments
Choose soft, moist foods that require less saliva for chewing and swallowing. Avoid spicy, salty, or acidic foods that irritate dry tissues. Protein-rich foods support oral health. Limit sugar and sticky foods that promote cavity development.
Managing Sleep Xerostomia
Dry mouth is often worse upon waking. Use a room humidifier while sleeping. Keep water at your bedside to sip during the night. Some patients sleep with their mouths forced closed using lip balm to prevent nighttime evaporation.
When to See Your Dentist
If you experience persistent dry mouth, schedule a dental visit. Your dentist can assess cavity risk and implement preventive strategies before problems develop. More frequent visits may be recommended to monitor for decay. Your dentist can also discuss medication side effects with your physician.