OBJECTIVE To evaluate the effect of irrigation with 0.06% chlorhexidine (PerioGard) (CHX) using a powered oral irrigator (Water Pik) with a special subgingival irrigating tip (Pik Pocket Subgingival Tip) compared to rinsing with 0.12% chlorhexidine gluconate once daily. METHODS Following a prophylaxis, patients were randomly assigned to an irrigation or a rinse group. The following clinical parameters were measured at baseline and at the 3-month end of the study: Modified Gingival Index (MGI), Plaque Index (PI), Bleeding Index (BI), and Calculus Index (CI). Also, a Stain Index (SI) was measured at 3 months. RESULTS Patients irrigating with diluted CHX showed a statistically significant reduction (P < 0.05) from their baseline in the MGI, PI, BI, and CI scores at 3 months. In the rinse group both MGI and BI showed statistically significant reduction from their baseline (P < 0.05) at 3 months. The rinse group showed a nonsignificant (P > 0.05) increase from baseline in CI and a nonsignificant decrease in PI. Intergroup comparisons showed that CHX irrigation produced statistically significantly greater reductions than CHX rinsing in the PI, MGI, and SI. The irrigation group also showed a greater reduction in BI and CI than the rinsing group but these differences were not statistically significant (P = 0.12). The results of this study suggest that use of diluted 0.06% CHX when used in a powered irrigator may be a valuable adjunct to oral health in patients with implants.