There is no such thing as “the fastest solution to a tasteless mouth”. The lack of taste in the mouth can be caused by physiological factors, as well as pathologic factors such as nutritional deficiencies and diabetes, and can be treated with general therapy and medication. 1. Physiological factors: the influence of psychological state on the sense of taste is obvious. When people are happy, their sense of taste is very sensitive, but when they are sad or depressed, they feel that their tongues are dry and their mouths have no flavor when they eat anything. Therefore, we should keep our emotions stable and happy, so our natural appetite will be good. 2. Nutrient deficiency: Vitamin B₁₂ deficiency, zinc deficiency, etc. can lead to taste disorders. It can be supplemented by eating foods high in vitamin B₁₂ and zinc, such as pig liver, almonds, oysters, etc. Some vitamin B₁₂ tablets and zinc gluconate can also be supplemented. 3. Diabetes mellitus: As diabetes mellitus can cause complications such as peripheral nerve damage, resulting in abnormal sense of taste. It can be treated with metformin etc. Mouth tasteless or to find the cause, if the symptoms persist, exclude physiological factors, it is recommended to consult a doctor in a timely manner, improve the examination, scientific treatment. The above drugs are used in accordance with medical advice.