We report the case of dental treatment for a patient of oral cenesthopathy followed by depression which appears to have been induced by the extraction of a tooth. The significance of the early discovery of depression in patients who require dental treatment and the adequate management of the mental status of such patients are discussed. This case suggests that the dental treatment that fails to take account of latent depression in a patient will not only obstruct improvement of the oral environment but also itself become a factor in making the depression worse.
