A November 2019 study by King's College London said, “Both the stimulation of saliva which can act as a natural barrier to protect teeth, and the mechanical plaque control that results from the act of chewing, can contribute to the prevention of dental caries [cavities]. Sugar-free gum can also act as a carrier for antibacterial ingredients including xylitol and sorbitol. No recent conclusive evidence existed prior to this review that showed the relationship between slowing the development of caries and chewing sugar-free gum,"