Bad breath is defined as the air breathed in that people perceive as unpleasant. It arises due to the following 3 causes:

1. Consumer goods such as alcohol, nicotine, coffee or garlic can cause bad breath.

2. Eating habits, such as a high-protein diet, can also lead to bad breath.

3. The most common cause, however, is bad breath-causing bacteria in the oral cavity, which will be discussed in more detail below.