Health conditions could be observed by monitoring changes of tonque shapes/colors, and coating thickness/colors, according to TCM (Traditional Chinese Medicine) Theories. One person's tonque type could be a combination of several types.

Qi, Blood, Yin, and Yang are Vital Energies and Essences in human bodies for maintaining life... Qi, Blood, Yin, and Yang are key factors for health condition analysis and improvement. Resolving the common issues in these factors for modern consititutions is one of our foundations in developing our formula that can apply to wide health needs.