Chlorhexidine
"I had gingivitis it did cure it. I noticed every time I rinsed my mouth with Chlorhexidine my eyes would turn red. It also raised my blood pressure from 140/90 right arm and 130/85 left arm, to 190/96 on the right arm and 173/110 on the left arm. This happened not to long after I rinsed with it. It took 2 days for my pressure to go back to normal. Caution for people with hypertension."