The upper and lower symmetrical cracks can be crowned, but also need to be careful not to bite hard objects, do not chew unilaterally. 1. A fissure is a tiny crack on the surface of a tooth that is not easy to detect. Although it is not easy to detect, the crack may extend all the way to the pulp, causing pulpal symptoms such as pulpitis and pulp necrosis. 2. If the fissure does not penetrate deep into the pulp cavity, the fissure can usually be abraded and treated with a filling. However, if it penetrates deep into the pulp cavity, root canal treatment is required, followed by crown restoration for protection. Crowns can be made for symmetrical cracks, but after doing so, you need to be careful not to bite hard objects and not to chew unilaterally. Whether or not crowns are needed for symmetrical cracked teeth, it is recommended to consult a professional doctor at a regular hospital.