01 Most common
Medications
More than 400 prescription and over-the-counter drugs reduce saliva flow — antihistamines, antidepressants, blood-pressure medications, decongestants, and muscle relaxants are the leading culprits.
Dry Mouth / Xerostomia
Restore saliva flow and protect your teeth from chronic dryness.
Dry mouth feels minor — until cavities, bad breath, and difficulty eating start. We identify the cause and treat it before damage compounds.
Free 15-minute phone consult · Mon · Tue · Thu 7am – 4pm · Wed 10am – 7pm
- Dr. Teah Nguyen, DDS — practice in Berkeley since 1996
- Medication-induced dry mouth specialist
- Same-day fluoride and saliva-substitute protocols
Clinically reviewed by Dr. Teah Nguyen, DDS
At a glance
Xerostomia is the medical term for chronic dry mouth — reduced saliva production that leads to discomfort, increased tooth decay, gum issues, and bad breath. Up to 20% of adults experience it, especially those on multiple medications.
- Most common cause
- Medication side effects (400+ drugs)
- Severity
- Treatable — but raises decay risk if ignored
- First step
- Saliva-flow assessment + medication review
Understanding Xerostomia
What dry mouth is — and why it matters
Xerostomia is reduced saliva flow that leaves the mouth feeling dry, sticky, or burning. Saliva does more than keep you comfortable — it neutralizes acid, washes away food, remineralizes enamel, and oxygenates the mouth so odor-causing bacteria cannot multiply.
When saliva drops, three things happen quickly: cavity risk rises sharply, gum inflammation increases, and bad breath becomes harder to control. The condition is almost always treatable — but the cause needs to be identified before symptoms get masked.
Common drivers include prescription medications (antihistamines, antidepressants, blood-pressure drugs), Sjögren's syndrome and other autoimmune conditions, head and neck radiation, and chronic mouth breathing.
Photo: Adolfo Félix / Unsplash Steady hydration is the cheapest intervention — and the one most patients underuse.
Why It Happens
The most common drivers of dry mouth
Xerostomia almost always traces to one of six categories. Identifying the dominant driver — usually with a medication review and salivary-flow test — is the foundation of treatment.
02
Medical Conditions
Diabetes, Sjögren's syndrome, stroke, thyroid disorders, and salivary-gland disease can all cause chronic xerostomia. Coordinated care with your physician is often part of the treatment plan.
03
Cancer Treatment
Radiation therapy to the head or neck damages salivary glands directly. Chemotherapy can temporarily alter saliva volume and composition. Targeted protocols protect remaining function.
04
Lifestyle Factors
Dehydration, smoking, alcohol, excessive caffeine, and habitual mouth breathing all suppress salivary flow over time. Reversible — but often overlooked.
05
Aging & Polypharmacy
Saliva production declines naturally with age, particularly when multiple medications stack their drying effects. The fix is often medication review, not aging.
06
Environmental Factors
Bay Area allergy seasons drive antihistamine use. Indoor heating, dry climate, and CPAP use without humidification all contribute. Small environmental changes often deliver disproportionate relief.
Photo: Raj Bhagat / Unsplash Saliva neutralizes acid, oxygenates the mouth, and clears bacteria — all the things that fail when xerostomia sets in.
Your Visit
What happens at your dry-mouth evaluation
- 0110 min
Symptom & medication review
Detailed timeline, current medications, and daily symptom log. Most cases solve here.
- 0210 min
Salivary-flow test
Measured stimulated and unstimulated saliva flow to objectively grade severity.
- 0315 min
Oral exam & decay risk assessment
Cavity check, gum-pocket measurement, and identification of any active demineralization that needs immediate care.
- 0410 min
Treatment plan & products
Custom plan covering saliva substitutes, prescription medications if indicated, fluoride protocols, and any physician-coordinated medication adjustments.
Dry mouth is dismissed as a minor annoyance until someone has six new cavities in two years. The earlier we identify the cause, the easier it is to protect the rest of the mouth.
Patient stories
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“Dr. Teah is excellent — caring, considerate, and very professional. Highly recommend.”
— Diana A., Berkeley
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“Good attention to detail. Diana at the front office very helpful. Amazing experience.”
— Bittu
Frequently asked questions
Is dry mouth serious?
Yes, when chronic. Reduced saliva increases the risk of tooth decay, gum disease, oral infections, and chronic bad breath. The condition itself is highly treatable — but ignoring it tends to compound dental problems quickly.
Can dry mouth go away on its own?
Sometimes. If it is caused by short-term dehydration, illness, or a temporary medication, it usually resolves once the trigger clears. Persistent dry mouth lasting more than a few weeks needs a clinical evaluation to find the underlying cause.
What can I do at home for quick relief?
Sip water often, use a bedside humidifier, chew xylitol gum to stimulate saliva, and avoid alcohol-based mouthwash, caffeine, and tobacco. These manage symptoms — but not the cause.
Which medications most often cause dry mouth?
Antihistamines (Benadryl, Zyrtec, Claritin), antidepressants (SSRIs, tricyclics), blood-pressure medications (especially diuretics), decongestants, and muscle relaxants. Stacking two or more multiplies the drying effect.
When should I see a dentist for dry mouth?
If your mouth feels persistently dry for more than a few weeks, or you notice difficulty swallowing, frequent cavities, or burning sensations on the tongue, schedule an evaluation. The earlier the cause is identified, the more enamel and gum tissue we can protect.