Tongue coating thick white with cracks in the middle of bad breath is considered with phlegm-dampness in the obstruction (phlegm-dampness evil qi stays in the spleen and stomach), depressed and heat (evil qi stays for too long will be transformed into heat), and depressed heat injures the yin, the treatment of clearing the heat and strengthening the spleen to facilitate the dampness, and nourishing the yin as the principle of treatment.
The metabolic disorder of fluid produces phlegm-dampness, which is embedded in the middle Jiao, and the qi of the spleen and stomach is fumigated on the upper part of the tongue, which is manifested on the tongue, i.e., the tongue coating is thick and white, and the phlegm-dampness is depressed for a long time and turns into heat, and the spleen and stomach contain heat, so the breath is smelly and dirty, and the heat damages yin, and the tongue loses its moistening, and the tongue surface is shriveled and becomes fissured.
Treatment should be based on strengthening the spleen, clearing heat and removing dampness (removing heat and dampness in the body) as the main principle of treatment, and taking into account the yin, can be used in the Pingtu San, Qingzhong Tang plus subtractions, with the addition of salvia, maitake, dendrobium, bamboo and other drugs to support the yin of the stomach. Note that allergy to the above drugs is prohibited.
Specifically need to be in the professional Chinese medicine doctor under the guidance of evidence-based treatment, do not take medication without authorization.