139 soldiers aged 28-32 years of a medical corps unit of the Swiss army were examined for their periodontal conditions. On 3 surfaces of all teeth, plaque deposits were assessed according to the Plaque Index System (Silness and Löe, 1964) and gingival health determined according to the Gingival Index System (Löe and Silness, 1963). Calculus deposits were evaluated on the 6 representative teeth of Ramfjord (1959). On 4 surfaces of the same teeth, pocket depths and loss of attachment were measured. The mean P1I was 1.38, the mean GI 1.11. The mean pocket depth was 2.52, and the mean loss of attachment was 1.38. The results of this study were compared with those of a previous study by Curilović et al. (1972). It was concluded that periodontal disease progressed in the Swiss male population between 20 and 30 years at an annual rate of 0.18 mm loss of attachment despite all the efforts in preventive dentistry.