title: Secondhand smoke may increase periodontal disease risk.
mesh_terms: D000328:Adult; D004781:Environmental Exposure; D006801:Humans; D010510:Periodontal Diseases / Q000209:etiology*; D012307:Risk Factors; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
chemical_list: D014028:Tobacco Smoke Pollution