Multiple choice Which of the following statements is false about closest speaking space? Closest speaking space was suggested by Silverman. Closest speaking space measures the vertical dimension when the mandible and muscles are involved in function of speech. Closest speaking space measures the vertical dimension when the muscles and mandible are in rest position. Closest speaking space in normal jaw relations is approximately 1.5 to 3 mm. Closest speaking space increases when there is small vertical dimension. Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is correct answer because this is incorrect statement about closest speaking space.