Bad breath, also known as halitosis, is an unpleasant condition that affects many people at some point in their lives. While bad breath is primarily caused by poor dental hygiene, there are other factors that can contribute to the condition. In dentistry, bad breath can be caused by a variety of oral diseases, as well as other medical conditions. Poor oral hygiene is the leading cause of bad breath. Food particles and bacteria can accumulate on the teeth and gums, leading to a foul odor. Brushing and flossing regularly can help reduce bad breath, as can using a tongue scraper to remove bacteria from the tongue. In dentistry, bad breath can also be caused by periodontal (gum) disease. This is an infection of the gums that can lead to bad breath if it is not treated. Other oral diseases, such as cavities, can also lead to bad breath. Certain medications can also cause bad breath. These include blood pressure medications, antidepressants, and antihistamines. In addition, dry mouth, which is caused by a lack of saliva, can lead to bad breath. Saliva helps to clean the mouth and wash away bacteria, so it is important to stay hydrated to keep mouth bacteria in check. Bad breath can also be caused by certain medical conditions, such as diabetes, acid reflux, and liver or kidney disease. These conditions can cause a buildup of certain compounds in the mouth, leading to bad breath. In dentistry, bad breath is typically treated with brushing and flossing, as well as regular visits to the dentist. If the bad breath is caused by a medical condition, then the underlying condition will need to be addressed. In some cases, bad breath can be treated with medication, such as antibiotics or antifungal agents.