Crest Pro-Health Mouthwash

I starting using this CPC mouth rinse after being diagnosed with gingivitis. I read some of the primary literature showing that this can marginally (but still significantly) improve gingivitis. However, this product can leave a brown residue on the teeth. Apparently this can be cleaned off by the dentist, but still could be a cosmetic issue. I noticed also that this mouthwash left my mouth tasting funny and kind of interfered with the taste of food.