Cracks in the center of the tongue and grooves on the side of the tongue may be caused by grooved tongue, abnormal digestive function and chronic tongue infection. 1. Grooved tongue: due to congenital abnormalities in tongue development, grooved tongue occurs, so there are cracks and grooves on the tongue. However, it does not have any effect on the health of the body, usually need to pay attention to good oral hygiene, to prevent the retention of food residues, to avoid causing infections. 2. Abnormal digestive function: Due to chronic gastritis, reflux esophagitis, dyspepsia and other reasons, the digestive function is reduced, affecting the digestion and decomposition of food. So it leads to the phenomenon of thick tongue coating, easy to crack, and tooth grooves on the side of the tongue. 3. Chronic lingual inflammation: Chronic lingual inflammation is triggered by poor oral hygiene, viral infection and lack of vitamin B12, resulting in cracks on the tongue. Chronic lingual inflammation may also lead to swelling of the tongue and the appearance of the tongue side of the phenomenon of dental grooves. If you have cracks in the middle of your tongue and grooves on the side of your tongue, you should go to the hospital in time and ask the doctor to make a clear diagnosis and treatment. Normally, you should pay attention to a light diet and maintain oral hygiene.