well when i use it it works unfortunelty i only bought only 1 oz and i used it all up too quickly i use it to irrigate my nose then dip my floss in it and so on. anyway i gotta buy more i plan on making my own mouthwash instead of buying the thera breath. u see therabreath is also made with stabilized oxygen. that is the ingredient also known as OXY-8 or something like that. but therabreath is diluted with too much water and not enough of the stabalied oxygen so i just thought that the anerobic oxygen or stabalized oxygen is better to buy so i can dilute it myself and not keep buying ten dollar mouthwash.but when i dont use the oxygen 3 times a day it does come back but my bad breath has not been even half as bad as before when it does come back. so the oxygen is working to some degree even when i ran out. i also believe mind over matter so if we believe somethings going to work it will work and if we dont then of course it wont.