Gingivitis can cause bad breath. The gum is a mucus membrane with supporting connective tissue covering the tooth bordering the jaw. The main function of the gum is protection. Gingivitis is inflammation of the gum. When the gum get infected it will become swollen, painful, and have a discharge. If the condition become worse the infection will spread towards the periodontal (tissues that surround and support the teeth) area leading to continuous discharge called pyorrhea. Some times the infection goes deep producing alveolar abscess with discharge of pus. Infection can even reach the bone causing osteomyelitis (inflammation or infection of the bone or bone marrow). This can cause bad breath.
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