There are a few different causes for bad breath. It ranges from stomach problems to diets and teeth problems. Most of the causes can be found in the mouth, they are:
1- Tongue (when bacteria grows in between the papilla)
2- Teeth cavities (especially when food particles get stuck in them)
3- Gum diseases
4- Extraction sites during healing
5- Dentures when not cleaned properly
6-Alcohol and tobacco
If you or someone you know is concerned about bad breath, the first step is a dental check up. Your dentist will be able to confirm or rule out teeth or mouth as the source of bad breath.