Objective To study the effect of porcelain veneer restoration on long-term periodontal health level and aesthetic effect in patients with anterior diastema. Methods A total of 100 patients who underwent anterior diastema restoration in Hefei Stomatological Hospital from April 2023 to March 2024 were selected as the research subjects. According to different restoration methods, they were divided into the control group and the observation group, with 50 patients in each group. The control group received resin restoration, and the observation group received porcelain veneer restoration. The periodontal health level, masticatory function, aesthetic effect, clinical efficacy and complications were compared between the two groups. Results At 1 year after restoration, the PI, GI and PD in the observation group were lower than those in the control group (P <0.05). At 1 year after restoration, the occlusal force and masticatory efficiency in the observation group were higher than those in the control group (P <0.05). The scores of marginal staining, color adaptation to adjacent teeth and integrity in the observation group were lower than those in the control group (P <0.05). The total effective rate of treatment in the observation group was 94.00%, which was higher than 88.00% in the control group, but the difference was not statistically significant (P >0.05). The incidence of complications in the observation group (2.00%) was lower than that in the control group (14.00%) (P <0.05). Conclusion Porcelain veneer restoration for anterior diastema has a better effect, which is beneficial to improving patients' periodontal health level, promoting masticatory function recovery, enhancing aesthetic appearance, and has a lower incidence of complications, with high application value.