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Another very common cause of bad breath is dry mouth. Saliva is rich in oxygen and when the mouth is dry, anaerobic bacteria that thrive in the absence of oxygen begin to dominate the oral cavity. These bacteria produce volatile sulfur compounds that smell like rotting eggs and old socks.

If you have noticed, your breath is not that pleasant when you wake up in the morning. This is because we normally have dry mouth when we sleep. And because we need saliva and water to cleanse the mouth, you can expect bad breath problem to arise when your mouth is dry and not producing enough saliva to wash off the food particles.

Dry mouth and tonsil stones frequently go hand in hand.