In the present study, we have followed a national cohort of dentists, academics, i.e. people with three or more years of post-high school education, and the general population for a period of ten years, and identified all cases of recognized suicide during the period 1961 to 1970. The aim of the study was to assess whether suicide rates are higher among dentists even after adjustment for socioeconomic factors. Results show an elevated standardized mortality ratio (SMR) for male dentists compared to other male academics. Female dentists did not exhibit any increased risk. It is suggested that enhanced interest should be given to the possible etiologic role of not only psychosocial factors but also to psychoorganic consequences of mercury exposure among dentists.