If you're looking for synonyms for the phrase "used mouthwash", you have a few different options. Some common alternatives include "rinsed with mouthwash", "brushed with oral rinse", or "gargled with oral antiseptic". All of these phrases refer to the act of using a liquid solution to clean and freshen the mouth, often after brushing or flossing. Other possible synonyms for "used mouthwash" might include "swished with oral disinfectant", "cleansed with dental rinse", or "administered oral hygiene solution". No matter which phrase you choose, the important thing is to maintain a regular oral hygiene routine that includes using an effective mouthwash.