Tongue thick white scraping down a layer of tofu dregs very smelly may be Candida albicans infection, coccidioidomycosis, lichen planus caused. 1. Candida albicans: the surface of the tongue may be infected with Candida albicans, so that the surface of the tongue appears white, or even white pseudomembrane, scraping down will be like white tofu dregs, accompanied by odor. 2. Coccidioidal stomatitis: patients due to poor oral hygiene habits, resulting in a large number of bacteria in the oral cavity reproduction, causing coccidioidal stomatitis, oral mucosal redness and swelling, tongue thick white scraping down a layer of tofu dregs is very smelly. 3. lichen planus: patients with long-term psychological stress, resulting in endocrine disorders, lichen planus, which caused the lesion area appeared congestion, vesicles, ulcers, tongue thick white scraping down a layer of tofu dregs is very smelly. If the tongue thick white scraping down a layer of tofu residue is very stinky, it is recommended to go to the hospital in time to find out the cause of the disease, under the guidance of the doctor, targeted treatment.