Artificial saliva made from sugarcane protein found to protect teeth

Scientists have developed an artificial saliva using a protein extracted from sugarcane that can bind directly to tooth enamel and protect it from acid and bacterial attack. The protein at the center of the research is called CANECPI-5. In laboratory testing, it adhered to enamel surfaces and formed a protective layer that resisted the kind of acidic conditions that typically cause dental decay.

This matters because natural saliva does exactly this job in a healthy mouth. It buffers acid, washes away bacteria, and deposits minerals back onto enamel through a process called remineralization. People who produce too little saliva, a condition called xerostomia that affects an estimated 10 percent of the general population and up to 40 percent of older adults, are at significantly higher risk of tooth decay, gum disease, and oral infections. An artificial saliva that genuinely mimics those protective functions would fill a gap that current over-the-counter products do not adequately address.

What CANECPI-5 is and where it comes from

CANECPI-5 belongs to a family of proteins called cystatins, which are naturally occurring inhibitors of enzymes called cysteine proteases. Plants produce cystatins as a defense mechanism against insects and pathogens. Sugarcane produces CANECPI-5 as part of its own biological protection system, and researchers investigating its properties found that beyond its antimicrobial activity, it has an unusual affinity for hydroxyapatite, the mineral compound that makes up tooth enamel.

That binding affinity is what makes CANECPI-5 interesting for dental applications. A protein that sticks to enamel can potentially deliver protective or antibacterial effects directly at the tooth surface, rather than just being present in the surrounding fluid. The research team confirmed through binding assays that CANECPI-5 does attach to hydroxyapatite with measurable strength, a necessary condition for any enamel-protective application.

How the artificial saliva formulation works

The artificial saliva formulation built around CANECPI-5 is designed to replicate the core protective properties of natural saliva rather than its complete biochemical composition. Natural saliva contains hundreds of proteins, enzymes, and electrolytes. Replicating all of that is not the goal here. The researchers focused on the protective shield function: keeping acid off enamel and limiting the adhesion of decay-causing bacteria like Streptococcus mutans, the primary bacterial driver of cavities.

In the laboratory tests, the CANECPI-5 formulation reduced bacterial adhesion to enamel surfaces and showed acid-buffering capability. Both outcomes are meaningful. Reduced bacterial adhesion lowers the chances of plaque formation at the enamel surface. Acid buffering directly counteracts the pH drop that occurs after eating sugary or acidic foods, which is the primary mechanism through which enamel erodes over time.

Who would benefit most from this kind of product

Dry mouth has multiple causes. Radiation therapy for head and neck cancers frequently damages the salivary glands, sometimes permanently. More than 400 commonly prescribed medications list dry mouth as a side effect, including antihistamines, antidepressants, diuretics, and blood pressure medications. Autoimmune conditions like Sjogren's syndrome directly attack salivary gland tissue. For all of these patients, the current options are mostly water-based sprays and gels that provide temporary moisture but offer little actual biochemical protection.

A formulation that actively protects enamel and inhibits bacterial adhesion would represent a functional improvement over what is currently available. It would also be particularly useful for elderly patients, who are more likely to take multiple medications that cause dry mouth and who already have higher rates of root caries and tooth loss.

From laboratory to clinical use: what still needs to happen

The research at this stage is in vitro, meaning it was conducted in controlled lab conditions rather than in human mouths. The oral environment is significantly more complex than a laboratory test system. Saliva is constantly swallowed and replaced, which means any protective coating needs to reapply efficiently. The mouth contains hundreds of bacterial species beyond Streptococcus mutans, and a product's safety and efficacy across that full ecosystem needs to be established before clinical use.

The research team's next steps involve animal model testing and eventually human trials to confirm that CANECPI-5's protective properties hold up under real-world oral conditions. Sugarcane is produced in large volumes globally, with Brazil and India together accounting for more than 60 percent of world production, which means the raw material for scaling CANECPI-5 extraction is not a supply constraint if the protein advances to commercial development.