Both Biotene and Xerostom significantly improve saliva production and reduce cavity risk in cancer patients with radiation-induced dry mouth. A 2026 randomized controlled trial of 66 patients found that Biotene increased saliva flow to 1.26 milliliters per minute compared to 0.76 for placebo, while both products reduced cavity-causing bacteria by over 90 percent. Biotene showed marginally superior results overall.
Cancer patients who receive radiation therapy often develop severe dry mouth, a condition that makes eating and speaking difficult. Researchers tested two commercial saliva substitutes, Biotene and Xerostom, to see if they could help. In a study of 66 patients, both products significantly improved saliva production, mouth pH balance, and reduced cavity-causing bacteria over six months. Biotene performed slightly better overall. According to Gram Research analysis, these findings suggest that saliva substitutes offer real relief for cancer patients struggling with radiation-induced dry mouth and may help prevent serious dental problems.
Key Statistics
A 2026 randomized controlled trial of 66 head and neck cancer patients found that Biotene increased salivary flow rate to 1.26 milliliters per minute compared to 0.76 milliliters per minute in the placebo group at six months.
According to research reviewed by Gram, both Biotene and Xerostom reduced cavity-causing Streptococcus mutans bacteria by more than 90 percent compared to placebo, with Biotene achieving counts of 9.20 colony-forming units per milliliter versus 118.75 in the placebo group.
A 2026 clinical trial found that Biotene increased protective mucin-7 protein levels to 77.71 nanograms per milliliter compared to 61.48 in placebo-treated cancer patients with radiation-induced dry mouth.
Both Biotene and Xerostom significantly improved mouth pH and buffering capacity in radiation-treated cancer patients, with improvements sustained over six months of consistent use.
The Quick Take
- What they studied: Whether two commercial saliva replacement products (Biotene and Xerostom) could help cancer patients whose mouths became very dry after radiation therapy
- Who participated: 66 head and neck cancer patients with severe dry mouth caused by radiation treatment. They were divided into three equal groups of 22 people each: one using Biotene, one using Xerostom, and one using a placebo (fake treatment)
- Key finding: Both Biotene and Xerostom significantly increased saliva production compared to placebo. Biotene produced 1.26 milliliters of saliva per minute versus only 0.76 for placebo. Both products also reduced cavity-causing bacteria by more than 90 percent and improved mouth chemistry
- What it means for you: If you’re a cancer patient with radiation-induced dry mouth, these products may provide meaningful relief and help protect your teeth. However, these results apply specifically to head and neck cancer patients and should be discussed with your doctor or dentist before use
The Research Details
This was a randomized controlled trial, which is one of the strongest types of medical research. Researchers randomly assigned 66 patients with radiation-induced dry mouth into three equal groups. One group used Biotene, another used Xerostom, and the third group received a placebo (a fake treatment). All participants used their assigned product for 28 days. The researchers then measured multiple aspects of mouth health at baseline and at 1, 3, and 6 months after treatment started. They measured saliva flow rate, mouth acidity (pH), the mouth’s ability to neutralize acids (buffering capacity), protective proteins in saliva, cavity-causing bacteria counts, and mouth sores. This design allows researchers to see if the products actually caused improvements rather than improvements happening by chance.
Radiation therapy for head and neck cancer is very effective at treating cancer but damages the salivary glands as a side effect. This causes severe dry mouth that can last for years. Dry mouth makes eating painful, increases cavity risk dramatically, and reduces quality of life. Testing actual saliva substitutes in real patients is important because it shows whether these products work in the real world, not just in a lab. The randomized design with a placebo group ensures that any improvements are actually from the products and not from other factors like time passing or patients expecting to feel better
This study has several strengths: it was randomized (reducing bias), it included a placebo control group (the gold standard), it measured multiple relevant outcomes (not just one), and it followed patients for six months (long enough to see real effects). The study size of 66 patients is moderate, which is appropriate for this type of research. One limitation is that the study only included head and neck cancer patients, so results may not apply to other types of dry mouth. The study was published in a peer-reviewed journal, meaning other experts reviewed it before publication
What the Results Show
Both Biotene and Xerostom dramatically improved saliva production. At six months, Biotene users produced 1.26 milliliters of saliva per minute compared to only 0.76 for the placebo group, an increase of about 66 percent. Xerostom users produced 1.00 milliliters per minute, still significantly better than placebo. Both products also improved the mouth’s pH (acidity level) and buffering capacity, meaning the mouth became less acidic and better able to neutralize acids that cause cavities. These improvements are important because adequate saliva is essential for eating, speaking, and protecting teeth. The products worked by providing moisture and protective compounds that the damaged salivary glands could no longer produce on their own.
The study measured protective proteins in saliva called mucins and defensins. Biotene increased mucin-7 levels to 77.71 nanograms per milliliter compared to 61.48 in the placebo group. Xerostom achieved 74.92 nanograms per milliliter. These proteins coat and protect the mouth’s tissues. The most striking finding involved cavity-causing bacteria called Streptococcus mutans. Biotene reduced bacterial counts to 9.20 colony-forming units per milliliter, Xerostom to 12.5, while placebo remained at 118.75, a reduction of more than 90 percent. Both products also reduced the severity of oral mucositis (painful mouth sores), a common side effect of cancer treatment. These secondary findings suggest the products work through multiple mechanisms, not just adding moisture
Previous research on saliva substitutes has been limited, with few head-to-head comparisons in actual cancer patients. This study provides the first rigorous comparison of Biotene and Xerostom in this specific population. The magnitude of improvements in salivary flow and bacterial reduction is larger than many previous studies of individual products, suggesting these formulations may be more effective than older versions or that the study population benefited particularly from the interventions. The findings align with laboratory studies showing that these products contain protective compounds, but this is the first clinical evidence demonstrating their real-world effectiveness in cancer patients
The study only included head and neck cancer patients, so results may not apply to people with dry mouth from other causes like autoimmune diseases or medications. The study lasted six months, so we don’t know if benefits continue beyond that timeframe or if patients maintain consistent use. The study didn’t measure patient satisfaction or quality of life improvements, only objective measurements. The sample size of 66 is moderate, so results might differ in larger populations. The study didn’t compare these products to other treatments like prescription medications or other saliva substitutes. Finally, the study was conducted at a single institution, so results may vary in different healthcare settings
The Bottom Line
For head and neck cancer patients with radiation-induced dry mouth, both Biotene and Xerostom appear to be effective options with strong evidence (high confidence). Biotene showed slightly better results overall. These products should be used as directed and combined with other dry mouth management strategies like frequent sips of water, sugar-free lozenges, and regular dental care. Discuss with your oncologist or dentist which product is best for your situation. These recommendations apply specifically to radiation-induced dry mouth in cancer patients and may not apply to other causes of dry mouth
Head and neck cancer patients experiencing dry mouth after radiation therapy should definitely consider these products. Dentists and oncologists treating cancer patients should be aware of these options. People with dry mouth from other causes (like autoimmune diseases or medications) may benefit, but this study doesn’t directly address their situation. Cancer patients in early treatment planning should discuss dry mouth prevention strategies with their care team before radiation begins
The study measured improvements at 1, 3, and 6 months. Some improvement in saliva flow appeared within the first month, with continued improvements through six months. Most patients should expect to notice benefits within the first few weeks of consistent use, though maximum benefits may take several months. Benefits appear to continue as long as the product is used regularly
Frequently Asked Questions
What is radiation-induced dry mouth and why does it happen to cancer patients?
Radiation therapy for head and neck cancer damages salivary glands, reducing saliva production. Saliva is essential for eating, speaking, and protecting teeth from cavities. Without adequate saliva, patients experience severe discomfort and increased dental problems that can persist for years after treatment
How do Biotene and Xerostom work to help dry mouth?
These products replace lost saliva by providing moisture and protective compounds like mucins and defensins. They coat the mouth, improve pH balance, and create an environment hostile to cavity-causing bacteria. The study showed both products increased actual saliva flow and protective proteins
Which product is better, Biotene or Xerostom?
Both products significantly improved dry mouth symptoms in the study, but Biotene showed marginally superior results. Biotene produced more saliva (1.26 versus 1.00 milliliters per minute) and higher protective protein levels. Individual response varies, so discuss with your dentist which works best for you
How long does it take to see improvement from using these products?
The study measured improvements at one, three, and six months. Some patients notice relief within the first few weeks of consistent use, though maximum benefits may take several months. Benefits continue as long as you use the product regularly
Can people with dry mouth from other causes use these products?
This study specifically tested cancer patients with radiation-induced dry mouth, so results may not directly apply to dry mouth from autoimmune diseases or medications. However, the products may still help. Discuss with your doctor whether these products are appropriate for your specific situation
Want to Apply This Research?
- Track daily saliva substitute use (morning, afternoon, evening) and rate dry mouth severity on a 1-10 scale at the same time each day. Also log any changes in eating ability, mouth comfort, or dental health observations
- Set phone reminders to use the saliva substitute at consistent times throughout the day, especially before meals and before bed. Keep the product in multiple locations (bathroom, bedroom, work) to increase consistent use. Pair usage with existing habits like after brushing teeth or with meals
- Track weekly averages of dry mouth severity scores and monthly assessments of eating comfort, speaking ease, and any new cavities or mouth sores. Share this data with your dentist at regular checkups to monitor long-term effectiveness and adjust products if needed
This research applies specifically to head and neck cancer patients with radiation-induced dry mouth. Results may not apply to dry mouth from other causes. Saliva substitutes are not a replacement for professional dental care or medical treatment. Always consult with your oncologist, dentist, or healthcare provider before starting any new product, especially if you are undergoing cancer treatment or have other medical conditions. Individual results may vary. This information is for educational purposes and should not be considered medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.