The various causes and treatments of periodontitis. Antibiotics, antiseptics, and probiotics have been used to control the microbial nature of periodontitis. Host modulation therapy has been used to reduce the destructive inflammatory response underlying periodontitis. Photodynamic therapy, a unique and promising technology, has been shown to address both the microbial and immunological basis of the disease. Proper diet and hygiene have been used to treat the environmental and behavioral aspects of periodontitis. As of yet, no treatment exists to address any potential underlying genetic predisposition to periodontitis.