The present study aimed to investigate the outcomes of non-surgical treatment of patients with chronic periodontitis by undergraduate dental students at King Saud University. Participants with severe or moderate chronic periodontitis who were over 18 years of age were eligible to participate. 33 patients formed the study sample and underwent non-surgical treatment under the supervision of skilled periodontists from undergraduate students. The mean numbers of teeth and dental sites with probing pocket depth less than 5 mm at the re-examination and maintenance visits were significantly higher (P < 0.01), while the mean number of teeth with probing pocket depths ≥ 5 mm was significantly lower (P < 0.001). In addition, the mean plaque values and gingival bleeding indices improved significantly (PI; P < 0.01, BOP; P < 0.001). Compared with the first inspection, there was no detectable change in the number of teeth during re-examination and maintenance visits. Nonsurgical periodontal treatment by undergraduate students was successful in improving the periodontal health in individuals with mild to severe chronic periodontitis.
