Generally, you can determine the extent of dental impaction through symptoms, clinical examination, and imaging. 1. You can determine the extent of cryptic fissure through symptoms and clinical examination. The fissure of cryptic fissure is within the enamel-dentin boundary, and is usually lightly colored without secondary caries damage. Cracks in the dentin of cryptic fissure reach the superficial and middle layers of dentin. They tend to be deeply colored, have secondary caries, and may show signs of dentin sensitivity. If the cracks reach the deeper layers of dentin, the pulp may be involved and symptoms of pulpitis may occur. 2. In addition, the extent of the fissure can be determined by grinding the fissure. If the crack is deep, it may be visible on oral CT. If you have a cracked tooth, it is recommended to go to the hospital in time for treatment or therapy under the guidance of the doctor.