Bad breath is usually blamed on inadequate oral hygiene, but the truth is that the problem can have many other causes - one of them being tonsil stones. The reasons for the development of tonsil stones are still unclear, but what is known is that they can lead not only to bad breath, but also to a metallic aftertaste or the feeling of having a foreign body in the throat. But what are tonsil stones in general and what can be done when they occur?