Background: Nowadays mandibular tooth overdentures retained by bar attachment are used on a wide scale as a substitute for the conventional complete denture thus further studies are required to verify this replacement.Methodology: Fourteen patients were randomly categorized into two equal groups. In the first group (Group I) patients received mandibular tooth-supported overdentures retained by metal bar attachment with plastic clip material while in the second group (Group II) patients received mandibular tooth-supported overdentures retained by bar attachment with PEEK clip material. All patients were scheduled for recall visits and pocket depth of around abutment was recorded at the time of loading, six months, and twelve months.Results: Regarding pocket depth: (Group I) was significantly higher than (Group II) after 6 and 12 months. Data were coded and entered using the statistical package for the Social Sciences (SPSS) version 28 (IBM Corp., Armonk, NY, USA). Data were summarized using mean and standard deviation. Comparisons between groups were done using an unpaired t-test. Comparison over time within the same group was done using paired t-test. P-values less than 0.05 were considered statistically significant. Conclusion:Within the limitations of this study: Tooth-supported overdenture retained by bar attachment with plastic clip is less recommended than tooth-supported overdenture retained by bar attachment with PEEK clip.