There are various causes of halitosis, some of which stem from dental disease. Poor hygiene is a big factor. If brushing and flossing isn’t practiced, foodstuffs can get stuck between teeth, or to the tongue, causing bacteria to flourish. .
Another source of bad breath may be Dry Mouth, a condition that stems from underproduction of natural saliva. Saliva moistens tissue and helps to keep the mouth clean, and the lack of it can increase the likelihood of a cavity. Artificial saliva that a dentist sprays directly into the mouth, can be used.