In this tutorial, we learn how to detect and avoid bad breath. If your mouth is very dry, it's going to smell worse and worse. The more oxygen and moisture that you have in your mouth, the less bacteria will be inside it. For people with halitosis, they have a big problem with bad breath. Bacteria lives in your tongue, so you can't scrape them away. You can take a test to see how bad your breath is with a machine. After you do this test, you can learn how to keep more hydrated. Once you have more hydration in your mouth your breath will be better!