白苔可见于多种情况，故仅以白苔辨证较为困难，还应结合舌苔的润燥，舌质的深浅以及全身证候而进行判断。
请让我看看你的舌头。你的舌质淡白、肿大，而且上面有一层薄白苔。
Show me your tongue, please. It is pale and swollen and is coated with a thin layer of a whitish fur.
提示白苔、黄苔有各自不同的细胞化学变化特点，并与辨证结果基本一致。
It indicated that white tongue coating and yellow tongue coating have different features in cytochemical changes which were in accordance with the syndrome differentiations.
清代1850 - 1911年期间苔色的变化特征为：白苔、黄苔的出现率上升，黑苔的出现率下降，复合苔色的描述增加。
From 1850 to 1911 in the Qing Dynasty, occurrence rate of tongue coating had changed. Those of white, yellow and compound fur were increased. On the contrary, that of black fur was decreased.
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