[header] How to clean your gums [title] Use antiseptic mouthwash. [step] You can get antiseptic mouthwash over the counter at the pharmacy. This type of mouthwash contains chlorhexidine, which can help to prevent a buildup of plaque on your teeth and gums. 
Only use the mouthwash as directed by your doctor or a pharmacist. Using mouthwash with chlorhexidine can stain your teeth brown so only use it occasionally.