Most bad breath is caused by oral microbes, but these flora are not necessarily easy to get rid of. Even after using common mouthwash, they may quickly reappear and begin creating oral odor all over again.
According to the Spanish news service Chiapas Hoy, many anaerobic bacteria live on the dorsum of the tongue, which is the back of the muscle, right next to the tonsils.
Brushing the tongue may not scrape away many of the microorganisms, since many toothbrushes cannot reach far enough back into the oral cavity. Even specialty tongue scrapers cannot remove bacteria in amounts significant enough to eliminate bad breath.
Similarly, gargling common mouthwash may kill some oral flora, but these can repopulate the tongue quite quickly.
Almost all typical mouthwashes guarantee the removal of approximately 99.99 percent of odor-causing bacteria. Considering the millions of bacteria lining the palate, teeth and tongue, tens of thousands of microbes will always remains.
Rather than trying to remove the cause, individuals with bad breath may instead treat the symptom by rinsing with a specialty breath freshening product that neutralizes odor molecules.