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001). Statistically significant difference in the concentration of H2S and CH3SH ( 0.001) and no significance for CH3SCH3 ( = 0.075) between patients with/without fixed crowns was found. The presence of halitosis was more prevalent in the subjects with crown parameters (subgingival margin, over-contoured margin, open-crown margin, over-contoured and under-contoured crowns) considered clinically defective/unacceptable ( 0.05). Presence of fixed dental crowns significantly contributes to the oral halitosis. Dental crowns with defec