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Interdental Lisping

What is it? Interdental lisping is when the tongue protrudes between the front teeth when producing /s/ or /z/, resulting in a “th” sound.  The /s/ becomes a voiceless “th”, as in “think”, and the /z/ becomes a voiced “th”, as in “those”.  Interdental lisping, also be known as “frontal lisping”, is a normal developmental […]

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