Other than that there are many reasons for a foul taste in mouth such as medications, infection of gums or cavities in teeth, post nasal drip as in sinusitis, salivary glands
infection, pharyngitis or strep
infection, dentures and artificial
tooth or filling of dental cavities, Sjogren’s syndrome and copper or lead toxicity, poor oral hygiene, diabetes, liver problems, vitamin B12 deficiency, and over consumption of fluoride which is commonly present in certain mouthwashes and toothpastes , cer