1/ Dental: a consonant produced with the tongue tip behind the upper front teeth (e.g. the first sound in that)
2/ interdental: a consonant produced with the tongue tip between the upper and lower teeth (e.g. the first sound in that)
3/ Other symbols may be much less familiar, as in the two ways of representing the “th” sounds in English.
4/ We use [θ], called “theta,” for the voiceless version, as in thin and wrath, and at the beginning and end of the phrase three teeth.
5/ We use [ð], called “eth,” for the voiced version, as in thus, then, feather and loathe.
6/ Because the teeth are involved in creating these sounds, they are called dentals.
7/ If these sounds are made with the tongue tip between (= inter) the teeth, they are described as interdentals.