Bad breath might be more than just embarrassing—it could be a warning sign. Fusobacterium nucleatum is a bacteria that lives in your mouth, especially in plaque and infected gums. Scientists have discovered this same bacteria in colon cancer tumors, and it’s not just hanging out there by accident. Research shows that F. nucleatum can actually travel from your mouth to your intestines, where it helps cancer cells grow and spread. Studies found way more of this bacteria in cancerous tumors than in