Yes, the full depth of the periodontal pocket may not be reached, but the water flushing can assist in treating the progression of the periodontal disease. We offer an Irrigating Periodontal Pocket Accessory Tip to reach deeper into the pockets, which is available on our website under Accessories. Please consult with your dental professional as to treating periodontal pockets deeper than 4 mm or if you have recently had periodontal surgery.