To reduce gingivitis and to help patients heal after certain dental procedures dentists often prescribe a Chlorohexidine mouth rinse. This antibacterial oral mouth rinse works by killing mouth bacteria. One of the possible side effects is teeth staining. A new retrospective study, evaluated 10 clinical trials, comparing the effectiveness Chlorohexidine mouth rinse with and without the addition of sodium fluoride. They found no significant difference in reducing gingivitis, plaque formation or tooth discoloration between the two different forms of mouthwash.