1, vitamin deficiency: lack of nutrients such as vitamin B or folic acid can lead to cracks on the tongue surface.
2, oral diseases: some oral diseases, such as dental caries, periodontal disease, oral candidiasis and so on. Will lead to cracks on the surface of the tongue.
3, tongue nipple atrophy: the tongue nipple is a structure on the tongue, responsible for sensing the taste of food. With the increase of age, the papilla of the tongue will shrink, resulting in cracks on the tongue surface.