Dentolabial consonant

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Tongue shape

Dentolabial consonants are consonants articulated with the lower teeth against the upper lip, the reverse of labiodental consonants. They are rare cross-linguistically, likely due to the prevalence of dental malocclusions (especially retrognathism) that make them difficult to produce,[original research?] but one allophone of Swedish /ɧ/ has been described as a velarized dentolabial fricative.[citation needed]

The diacritic for dentolabial consonants in the Extended IPA is a superscript bridge,  ͆, by analogy with the subscript bridge used for labiodentals. For example, the voiced dentolabial fricative is transcribed , and the dentolabial nasal .