<unk>  is one of the seven categories of periodontitis as defined by the American Academy of Periodontology 1999 classification system and is one of the three classifications of periodontal<unk>  and conditions within the 2017 classification.<unk>  are a type of inflammatory periodontal (gum)<unk> caused by bacteria (notably fusobacteria and spirochaete species). The<unk>  appear to represent different severities or stages of the same<unk> process, although this is not completely certain. These<unk>  usually have a sudden onset, and so the term acute is often added to the diagnosis. The mildest on the spectrum is<unk>  ulcerative gingivitis (NUG), followed by the successively more severe conditions<unk>  ulcerative periodontitis (NUP),<unk>  stomatitis and finally cancrum oris (noma), which is frequently fatal.
Necrotizing periodontal diseases
Skin and skin structure infection
Antibiotic use in dentistry
Effects of flooding on skin
Drug-related gingival hyperplasia
Salivary gland disease
Periodontal disease
Cutaneous perforating disorders