Objective To explore the aesthetic effect of orthodontic combined with periodontal splint in the treatment of fan-shaped displacement of anterior teeth caused by Periodontitis (PD). Methods Eighty patients with fan-shaped displacement of anterior teeth caused by PD admitted from April 2023 to May 2025 were selected as the research objects. The control group received simple periodontal basic treatment, while the experimental group received orthodontic treatment combined with periodontal splint fixation on the basis of the control group. Periodontal health indicators, aesthetic evaluation indicators and masticatory function indicators after treatment were compared between the two groups. Results After treatment, the Probing Depth (PD) and Attachment Loss (AL) in the experimental group were lower than those in the control group; the Pink Esthetic Score (PES) in the experimental group was higher than that in the control group [(10.15±1.24) points]; the masticatory efficiency in the experimental group was (89.65±4.32)%, which was higher than (75.34±5.16)% in the control group; the differences in the above indicators between the two groups were statistically significant (P < 0.05). Conclusion Orthodontic combined with periodontal splint in the treatment of fan-shaped displacement of anterior teeth caused by PD can effectively improve periodontal health, enhance the aesthetic effect of anterior teeth, and strengthen masticatory function, which has high clinical application value.