Most of the time bad breath is caused by these ‘stones’ that form on the tonsils. They release a foul smelling gas that smells like sulphur.
Those formations are just lumps of mucus, bacteria and food that gets stuck in the back of the throat. The usually ‘fall off’ by themselves, but if they don’t you may remove them yourself. It requires some ‘bravery.’
With the help of a pointless prop, you can lightly press the wall of your throat and they will show up, ant they’ll stick to the prop. And that’s that!