Accentuation of the labio-mental fold is seen when which facial condition is present?

• A. open bite
• B. the lower part of the face is decreased
• C. crossbite in the frontal part
• D. the lower level of the face is enlarged

Answer: (B)

Accentuation of the labio-mental fold follows changes in the vertical dimension of the lower face. When the lower part of the face is reduced in height, the chin sits relatively higher and the distance between the lower lip and chin decreases. This brings the lip-chin region into closer contact and makes the groove between them—the labio-mental fold—more pronounced.

In contrast, increasing the lower facial height tends to soften or reduce that prominence, while dental conditions like open bite or frontal crossbite don’t directly determine this soft-tissue fold.