Purpose: This study explored the relationship between matrix metalloproteinase−8 (MMP−8) gene polymorphisms (−799C/T, −381A/G, and +17C/G) and peri-implantitis, examining clinical parameters including the probing depth (PD), clinical attachment level (CAL), and bleeding on probing (BOP). Here, MMP8 is linked to Peri-Implantitis.