This document discusses the relationship between vitamin deficiencies and periodontal disease. It begins by explaining that nutritional deficiencies can weaken the body's defenses against oral infections like periodontitis. It then examines several specific fat-soluble and water-soluble vitamins in more detail, describing how deficiencies in vitamins A, D, E, K, B1, B2, B3, B4, B6, and B12 can impact periodontal health and cause oral manifestations. Several studies are referenced showing links between vitamin D, folic acid, and antioxidant deficiencies and worsened periodontal outcomes.