Bidental consonants, pronounced with both the lower and upper teeth, are normally found only in speech pathology. The Extended IPA symbol is both a superscript and a subscript bridge, [  ̪͆]. Speech pathology, also termed speech-language pathology and speech & language therapy (SLT, mainly in the UK) is the study of disorders that affect a persons speech, language and swallowing. ...

Besides interdental consonants such as [n̪͆], which involve the tongue, there is at least one confirmed attestation of a true bidental consonant in normal language. The Black Sea sub-dialect of the Shapsug dialect of Adyghe has a bidental non-sibilant fricative where other dialects have [x], such as xə "six" and daxə "pretty". Therefore it might best be transcribed [x̪͆]. However, there is no frication at the velum, and the teeth themselves are the only constriction: "The lips [are] fully open, the teeth clenched and the tongue flat, the air passing between the teeth; the sound is intermediate between ʃ and f" (quoted in Ladefoged & Maddieson, The Sounds of the World's Languages, pp 144-145). Interdental consonants are produced by placing the blade of the tongue against the upper incisors. ... Map of the Black Sea. ... Adyghe (Адыгэ) is one of the two official languages of the Federal Republic of Adygeya in the Russian Federation. ... A sibilant is a type of fricative, made by speeding up air through a narrow channel and directing it over the sharp edge of the teeth. ... Note: This page contains phonetic information presented in the International Phonetic Alphabet (IPA) using Unicode. ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ...