Jagged edges on both sides of the tongue may be caused by lingual inflammation, megaglossia, or tumor lesions. It may also be a normal phenomenon. 1. Normal phenomenon: staying up late and eating spicy and stimulating food may make the bite marks on the edge of the tongue obvious, usually after a light diet and attention to rest will improve. 2. Tongue inflammation: Chronic inflammation of the tongue may cause the tongue to enlarge, and long-term dental friction may also cause jagged edges on both sides of the tongue. 3. Megalodontia: Megalodontia can cause benign hypertrophy of the tongue, and frequent friction between the tongue and teeth may also make the two sides of the tongue become uneven. 4. Tumor lesions: Tumor diseases such as lymphangiomas, whether benign or malignant, can cause the tongue to increase in size, resulting in jagged edges on both sides. Since there are various reasons for jagged edges on both sides of the tongue, it is necessary to consult a doctor in time to find out the specific reasons and treat them actively.