Most cracks in the middle of the tongue are caused by fissured tongue, while asymptomatic fissured tongue usually does not require treatment. Fissured tongue, also known as fissured groove tongue and furrowed tongue, the causative mechanism has not been clearly defined, and may be related to infection, genetics, micronutrient deficiencies, and immune dysfunction. The main symptom of fissured tongue is that there are crisscrossed fissure grooves and cracks on the surface of the tongue, and many small fissure grooves emanate from the surface of the tongue and radiate to the side. Different forms, different arrangements, different depths and lengths, and different numbers of grooves or fissures on the back of the tongue are the most typical symptoms of the disease. Generally asymptomatic fissured tongue does not require treatment, and attention to maintaining oral hygiene is sufficient. However, if inflammation occurs in the papilla of the tongue, 0.2% chlorhexidine, 2% sodium bicarbonate can be used to gargle; if combined with Candida albicans infection, oral mycotoxin can be included. Specific medication should be taken under the guidance of a doctor after medical examination.