So how do you go out and find a bad breath cure that works but isn't going to break your bank or risk your health. Well you should probably talk to your family doctor and or your dentist and get his or her advice. This is your best bet because these people have the background training that allows them to understand the pathophysiology around this common but very socially disturbing problem. They also have the training and knowledge required to safely use some of the effective options that are available that can really knock out your halitosis once and for all.
Let me try to give you some basics of bad breath. First the main issue is that the smell comes from bacteria that have colonized your oral cavity. In order to come up with an effective bad breath cure you have to either find a way to limit the colonization of these bacteria in your mouth or to limit the substrates that the bacteria use to create the foul smell. Oral hygiene is therefore an obvious start. So yes you have to brush your teeth regularly if you haven't been.
Most people already do this so the next step is brushing your tongue as well as your teeth. This is because your tongue is actually the main breeding ground for this smelly bacteria and by brushing your tongue you are actually dislodging millions of bacteria and keeping the population at bay. Mouth rinsing helps too. This is another way that you can dislodge bacteria from all of the pits and crevices in your mouth and wash them down the drain. You can either rinse with water (which actually works better than most people give it credit) or some sort of antibacterial mouthwash that not only dislodges but also kills part of the population with each swish and gargle.
If you are already doing this regularly and have had no success with the bad breath than you need to go to the next level up. This is changing your diet. Bacteria love foods rich in carbohydrates especially simple sugars. This is what they use to both live and to create those noxious fumes so cutting them out of your diet tends to help. The other diet modification is to eat yogurt. This is something that not many people think of but can be really effective. You see yogurt contains a benign bacteria that doesn't give off bad smells and can kick the bacteria out by out competing them for a place in your mouth.