Interdental consonants are produced by placing the blade of the tongue against the upper incisors. This differs from a dental consonant in that the tip of the tongue is placed between the upper and lower front teeth, and therefore may articulate with both the upper and lower incisors, while a dental consonant is articulated with the tongue against the back of the front incisors. In speech, consonants may have different places of articulation, generally with full or partial stoppage of the airstream. ... Labials are consonants articulated either with both lips (bilabial articulation) or with the lower lip and the upper teeth (labiodental articulation). ... In phonetics, a bilabial consonant is a consonant articulated with both lips. ... Labial-velar consonants are doubly articulated at the velum and the lips. ... The Yelî Dnye language of Rossel Island, Papua New Guinea, appears to be unique in having labial-alveolar and labial-postalveolar places of articulation, as illustrated below. ... In phonetics, labiodentals are consonants articulated with the lower lips and the upper teeth, or viceversa. ... Coronal consonants are articulated with the flexible front part of the tongue. ... Linguolabials are consonants articulated by putting the tongue tip or tongue blade against the upper lip. ... Dentals are consonants articulated with either the lower or the upper teeth, or both. ... Alveolars are consonants articulated with the tip of the tongue against the alveolar ridge, the internal side of the upper gums (known as the alveoles of the upper teeth). ... An apical consonant is a phone produced by obstructing the air passage with the very tip (end) of the tongue. ... A laminal consonant is a phone produced by obstructing the air passage with the flattened end of the tongue. ... Postalveolar (or palato-alveolar) consonants are consonants articulated with the tip of the tongue between the alveolar ridge (the place of articulation for alveolar consonants) and the palate (the place of articulation for palatal consonants). ... In phonetics, alveolo-palatal are consonants articulated with the tip of the tongue between the alveolar ridge and the palate, but closer to the palate than for postalveolar consonants. ... retroflex plosive Retroflex consonants cover two points of articulation. ... Dorsal consonants are articulated with the back of the tongue against either the hard palate, or the flexible velum just behind it, or even against the uvula. ... Palatal consonants are consonants articulated with the middle or back part of the tongue raised against the hard palate (the middle part of the roof of the mouth). ... In phonetics, the labialised palatal approximant or labial-palatal is a consonant with two constrictions in the vocal tract: with the tongue on the palate and at the lips (rounded). ... Velars are consonants articulated with the back part of the tongue (the dorsum) against the soft palate (the back part of the roof of the mouth, known also as the velum). ... Uvulars are consonants articulated with the back of the tongue against or near the uvula, that is, further back in the mouth than velar consonants. ... Radical consonants are articulated with the root (base) of the tongue in the throat. ... A pharyngeal consonant is a type of consonant which is articulated with the root of the tongue against the pharynx. ... An epiglotto-pharyngeal consonant is a newly reported type of consonant, articulated with the epiglottis against the back wall of the pharynx. ... An epiglottal consonant is a consonant that is articulated with the epiglottis against the back of the pharynx. ... Glottal consonants are consonants articulated with the glottis. ... Phonetics (from the Greek word φωνή, phone = sound/voice) is the study of sounds (voice). ... The International Phonetic Alphabet. ... The International Phonetic Alphabet. ... Many animals have longer and more flexible tongues than humans. ... Incisors are the first kind of tooth in heterodont mammals. ... Dentals are consonants articulated with either the lower or the upper teeth, or both. ... In speech there are different ways of producing a consonant. ...

Although this articulatory configuration is by no means exotic in the sense that it involves the tongue blade and the upper incisors, both frequently employed in the formation of other consonants, interdental realisations of consonants are rare cross-linguistically. Interdental realisations of otherwise dental consonants do appear to be more frequent as idiosyncrasies or due to coarticulatory effects of a neighbouring interdental sound. The most commonly occurring interdental consonants appear to be interdental non-sibilant fricatives. Interdental consonants do not appear to contrast with dental consonants. 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. ...

Voiced and voiceless non-sibilant interdental fricatives appear as realisations of the initial sounds in American English in words like 'then' and 'thin'. In British English, these sounds are more likely to be dental. American English (AmE) is the form of the English language used mostly in the United States of America. ... British English is a term used by people outside the UK to refer to the form of the English language spoken in the British Isles. ...

An interdental /l/ occurs in some varieties of Italian, and may also occur in some varieties of English, though the distribution and usage of interdental /l/ in English are not clear.