Place the tongue depressor against and next to the 1st stroke of the pencil drawn in the naso-genius groove.
The width of the tongue depressor must be placed outside the nasolabial fold

Trace the nasolabial area using the contours of the tongue depressor without changing its previous position

Complete the marking

To divide the naso-genial area into quadrants, use the tongue depressor which is applied from the bottom to the top of the naso-genial area.

we proceed as before from bottom to top

In general we can obtain 3 or 4 quadrants.

There is no symmetry between the right and the left hemiface , which means that 3 quadrants can be seen on one hemiface  and 4 others on the controlateral one for the same patient. quadrants.

Each vector has to be applied ,, normal,, to the plan of each NFLs square or quadrant.

• 1 Vector per Square
• Applied to the center of each square
• Normal or perpendicular to the plan of the Naso Labial Furrow Area.

As precedent. The pen is showing how to apply a vector.