Objective To explore the effect of Dyract composite material in the restoration of tooth defect. Methods A total of 80 patients with tooth defect admitted to the Affiliated Stomatological Hospital of Suzhou Vocational Health College from June 2022 to December 2024 were selected, and they were divided into the control group and the study group by the random number table method, with 40 patients in each group. The control group was treated with light-curing composite resin filling material for oral restoration, and the study group was treated with Dyract composite material for oral restoration. The periodontal indexes, periodontal tissue status, adverse event rate and rest oration satisfaction were compared between the tw o groups. Results After restoration, the PLI, AL and GI in the study group were lower than those in the control group (P <0.05). The sulcus bleeding index, gingival crevicular fluid volume, and alkaline phosphatase (ALP) and aspartate transaminase (AST) in gingival crevicular fluid in the study group were lower than those in the control group (P <0.05). The incidence of adverse events in the study group (2.50%) was lower than that in the control group (17.50%) (P <0.05). The satisfaction rates of no marginal staining, retention, color, appearance and marginal adaptation in the study group were higher than those in the control group (P <0.05). Conclusion Dyract composite material has a definite effect in the restoration of tooth defect. It can effectively improve the periodontal indexes and periodontal tissue status of patients, help to reduce the incidence of adverse events and improve restoration satisfaction, which is worthy of clinical application.