CD274 and dry eye syndrome: In this study, to investigate the role of overexpressing PD‐L1 in gingival basal KCs, we compared periodontal inflammatory responses at an earlier time point (7 days) and alveolar bone resorption at a late time point (7 weeks) between wild‐type (WT) and K14‐PD‐L1tg mice in a ligature‐induced periodontitis model.