Please choose the correct ending to complete the given sentence: Computers and Electronics: [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.

Ending1: [title] Use over the counter pain relievers. [step] While you might not want to stop the use of over the counter meds (look through your medical textbook or the self-help manual), you might want to reduce your pain or discomfort by switching to over the counter pain relievers. Ending2: It works by killing bacteria that could interfere with the cleanmaking process. Rinsing your mouth with a soft cloth before you ingest the mouthwash will also help exfoliate your gums. Ending3: 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. Ending4: [substeps] You should use this mouthwash twice per day, at minimum seven days a week. If you're trying to clean your gums, don't try to use the mouthwash once more, as it can irritate the gums.

Answer format: ending1/ending2/ending3/ending4