A study was undertaken to estimate the time taken to carry out the common periodontal treatments. Patients attending a university dental hospital were followed up until the end of their periodontal treatment. The average patient reqtuired 3.1 hours of treatment spread over 9.3 ± 3.9 visits. The largest proportion of the time was for doing scaling (39.3 %) ‐ that took 72.8 ± 41.0 minutes per patient. Patient education took 30.2 % of the time ‐ 55.9 ± 21.8 min per patient, examination 18.5 % (26.2 ± 17.3 min) and surgery 11.6 % (21.4 ± 46.3 min per patient). As the number of patients requiring surgery was small, timings of surgery were done on additional groups of patients. The 75 surgical procedures took 51.9 ± 29.7 min each ‐ an average of 14.3 ± 12 min per tooth. Most of the periodontal treatment was done by auxiliaries; they carried out 68.5 % of treatment (education, scahng and charting), whilst the dentists carried out the examinations and the surgery. The treatment of 60 patients at an industrial clinic was timed. Education took 8.0 ± 4,7 min and scaling and polish, 26.7 ± 16.1 min per patient. The examination time increased with increased severity of disease; patient education increased with increases in debris scores and periodontal scores; the scale and polish time increased with increasing debris, calculus and periodontal scores. The number of visits increased with increases in debris, calculus and periodontal scores. The results indicate that commonly used periodontal indices can be used to estimate treatment times and types of personnel required.