How long does THC stay in saliva after use and does listerine get rid of it?

THC can typically be detected in saliva for up to 1 to 3 days after use, although this can vary based on factors like frequency of use and metabolism. While products like Listerine may help mask the odor of marijuana and possibly reduce the concentration of THC temporarily, they are not effective at completely eliminating THC from saliva. If you are concerned about drug testing, it's best to allow sufficient time for THC to clear naturally.