Researchers then took saliva and tongue coating samples to measure bacteria levels and odour-causing compounds, includin然后研究者们提取了他们唾液和舌苔的样本，用于测量（口腔内的）细菌水平和能诱发异味的化合物，如硫化氢。
The tongue coating is regarded as thin coating if the underlying tongue surface can be seen faintly, whereas the thick c舌苔的厚薄，也就是透过苔能隐隐见到舌体的为薄苔，不能见到舌体的为厚苔。