For as long as medicine has fought infection, it has struggled with a paradox: the weapons powerful enough to destroy harmful microbes often destroy beneficial ones too. Researchers at Nagoya University have now adapted a cancer-targeting technique to address gum disease with unusual precision, using light-activated antibodies to eliminate a single pathogenic bacterium while leaving the mouth's broader microbial community intact. The work, published in June 2026, suggests that the future of treating infection may lie not in broad suppression, but in surgical selectivity — a philosophy that cou