Figure 4 shows the relationship of CD4+/CD8+ ratio with the variables “type of prosthesis” (all‐on‐4, single crown/bridge), “peri‐implantitis,” and “mucositis.” No correlations were observed between type of prosthesis and CD4+/CD8+ ratio, and between peri‐implantitis and CD4+/CD8+ ratio. This evidence concerns the gene CD4 and mucositis.