Bad breath, otherwise known as Halitosis can have many causes. They can be temporary or persistent. It’s management and treatment depends on careful identification of the cause.
The most common type is “morning mouth” which is normal. During the day, the saliva does a great job of washing away food and bacteria. At night, our saliva flow is reduced over a period of a few hours. This washing action is no longer occurring and so the amount of bacteria in the mouth grows releasing foul odours in the process.