Physiognomy of the Mouth
In death, much of the facial expression is concentrated on or about the mouth and lips (in life the eyes are the most expressive feature).
The mouth probably has more posturing or posing problems than the eyes. As with all features, the shape of the mouth is bilaterally asymmetrical
In normal repose, the upper and lower teeth are slightly parted. The two mucous membranes make gentle contact.
The two mucous membranes are not identical in color, the upper is usually “less red” than the lower
The true color of the lips is best described as a varied complexion coloring with a reddish overtone.
Increasing the width of the lower mucous membrane and decreasing the width of the upper mucous membrane creates the illusion of a pleasant expression (a very slight smile).