Bad breath is caused by food particles or infections in the mouth. When this happens, the moist conditions inside the mouth allow bacteria to thrive and because of the humidity, the bacteria turn foul and exhibit a scent. This scent is what we identify as bad breath. Infections like gum disease and tooth decay are some of the leading reasons for bad breath and when the mouth is not cleaned for extensive periods of time this scent can become a permanent fixture in our mouths.
Severe infection of the gums is known by a number of different names. Gum disease and periodontitis are both severe forms of gum infection and if any irritation in your gums is notice you should see your dentist straight away.