Stomatitis is a general term for inflammation of tissues lining the mouth.
Different parts of the mouth can become inflamed and the term would depend on which particular mouth part you are talking about. Here are a few examples:
Glossitis is inflammation of the tongue
Tonsillitis is inflammation of the tonsils
Sialadenitis is inflammation of the salivary glands
Pharyngitis is inflammation of the pharynx (sore throat)
Gingivitis is inflammation of the gums
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Gingivitis is inflammation of the gums and periodontitis is the infection of the ligaments and bones that support the teeth. I have never heard of the teeth themselves actually becoming inflammed.