Very expensive, but you can make these go a long, long way by mixing them with some other less powerful rinse. If you have never used this full strength as it comes out of the bottle, get ready. It's a real mouthful! VERY strong. Better tasting then Listerine, but just as or more powerful. Too powerful for me. I mix it with Plax (1/3 Rembrandt to 2/3rd Plax) and it's just right and really cleans up the breath.