FIGURE 1.

Representative tongue images. (A) Tooth-marked tongue with a very obvious contour distortion along both sides of the tongue, accompanied by the color change of the extruded area of the tongue; (B) Non-tooth marked tongue. The tongue body is flat, theperipheral contour is regular, and there is no contour distortion and color change area; (C) Suspicious tooth-marked tongue. The identification is controversial because the tongue body is flat and the peripheral contour is not distorted. Finally, the tooth-marked tongue is determined by the color change of the extruded area of the tongue edge.