Plant-based chewing gum reduces oral microbes associated with head and neck cancer

The research team collected saliva and oral rinse samples from patients with HNSCC and exposed these in the laboratory to extracts prepared from the chewing gum. The chewing gum formulation contained a protein derived from lablab beans that can bind to viruses and trap them, helping prevent their entry into host cells. This antiviral effect significantly reduced the detectable amount of HPV in the samples.

The researchers then optimised the chewing gum formulation by adding an antimicrobial peptide, seeking to target Porphyromonas gingivalis and Fusobacterium nucleatum, oral bacteria that have been implicated in oral cancer and HNSCC progression and survival outcomes. In ex vivo experiments, they found that the formulation reduced the concentration of both bacteria in saliva and oral rinse samples by more than 99%. The study also reported only minimal effects on selected non-pathogenic oral bacteria.

This new study builds on previous research from Prof. Daniell’s group on oral delivery platforms. That work developed antiviral chewing gums to lower SARS-CoV-2 levels in the oral cavity and to reduce viral loads of herpes simplex virus and influenza in the mouth.

According to Prof. Daniell, the next step is clinical evaluation after regulatory authorisation. “Based on the successful reduction of these pathogens in ex vivo clinical studies, we plan to advance antiviral and antibacterial chewing gums for evaluation in HNSCC patients after authorisation by the US Food and Drug Administration of an investigational new drug application,” he said.

The study findings add to a growing literature on the role of the oral microbiome in oral and oropharyngeal cancer. Recent systematic reviews have examined the global prevalence of HPV in oral and oropharyngeal squamous cell carcinoma and the prognostic significance of the oral microbiome.

The study, titled “Ex vivo HNSCC clinical studies using saliva and antiviral or antibacterial chewing gums reveal reduction in carcinogenic microbes”, was published online on 9 February 2026 in Scientific Reports.