We analyzed single‐cell RNA sequencing (scRNA‐seq) data GSE171213, which included 4 healthy control (HC) individuals, 5 periodontitis (PD) individuals, and 3 individuals with periodontitis after treatment (PDT), to further investigate the relationship between FAP, OLN, and periodontitis outcomes.[23] Following data filtering and dimensionality reduction, gingival tissue cells were categorized into 18 distinct clusters (Figure S3A, Supporting Information), each defined by specific cell markers (Figure S3B, Supporting Information). Here, FAP is linked to periodontitis.