Maxillary anterior tooth length can be evaluated using which of the following phonetic guidelines:
A . "S" sounds can be utilized to determine length relative to the vermilion border of the lower lip.
B . "F" sounds can be utilized to determine length relative to the lower incisors.
C . "E" sounds can be utilized to determine length relative to the midway point between the upper and lower lips.
D . "M" sounds can be utilized to determine length relative to lower incisors.
Answer: C