What is a cracked tooth?
A cracked tooth has a fracture line running through the enamel and sometimes deeper into the dentin or root. Cracks often develop gradually from years of chewing force, clenching or grinding, large fillings that weaken the walls of the tooth, or biting unexpectedly on something hard. They are most common in molars, which take the greatest pressure, and in teeth that already carry large fillings. Sudden temperature changes, such as drinking ice water right after hot food, may also add stress to enamel.
Cracks range from harmless surface lines in the enamel, called craze lines, to splits that extend below the gum. The treatment depends on where the crack starts, how far it reaches and whether the nerve is involved.
Common symptoms of a cracked tooth
- Sharp pain when biting down, especially when releasing the bite
- Brief sensitivity to cold, heat or sweet foods
- Pain that comes and goes and is hard to pinpoint to one tooth
- Swelling of the gum near a single tooth
Because the discomfort is intermittent, many people delay a visit. A crack, however, can deepen over time, so it is worth having symptoms checked early. If pain becomes severe or swelling appears, see our page on emergency dental care.
Treatment options and who they suit
Surface cracks and craze lines
These usually need no treatment, or simple polishing or composite bonding for appearance.
Fractured cusp
When a piece of the chewing surface breaks off, an onlay or crown can rebuild and protect the tooth.
Crack extending toward the center
A full-coverage crown holds the tooth together and reduces flexing. If the crack has reached the nerve, root canal treatment is performed first, followed by a crown.
Split tooth or vertical root fracture
When a crack separates the tooth into segments or runs down the root, the tooth often cannot be saved. Extraction and replacement with an implant, bridge or denture may then be discussed.
How we diagnose and treat cracks at E&D Dental
- Listening to your symptoms. We ask when the pain occurs, which foods trigger it and whether you clench or grind.
- Detailed examination. The Q-ray intraoral camera magnifies the tooth surface and can help reveal crack lines, while bite tests on individual cusps help locate the source of pain. Gum measurements around the tooth can indicate a deeper crack.
- Imaging. Fine cracks rarely show on standard X-rays, but X-rays and, where useful, low-dose 3D CBCT help assess the root, bone and any infection.
- Explaining the findings. We show you the images, explain how far the crack seems to reach and whether treatment should happen now. Sometimes the full extent only becomes clear once an old filling is removed.
- Treatment. The tooth is numbed with the clinic's 3-step painless anesthesia system: topical anesthetic, Endo-Frost cold numbing and a computer-controlled injection device. The crack is then restored with the option agreed, often starting with a protective temporary crown.
Recovery and protecting the tooth
Many patients notice that biting pain eases once the tooth is covered and held together.
After treatment, mild tenderness for a few days is common. Until the final restoration is placed, avoid chewing hard or sticky foods on that side. Over the long term:
- Avoid chewing ice, hard candy or bones, and do not crack nuts with your teeth
- Wear a night guard if you clench or grind during sleep
- Have large old fillings reviewed at check-ups before they fracture the tooth
Risks and limitations
Unlike a broken bone, a cracked tooth does not heal. Treatment aims to stop the crack from spreading and relieve symptoms, but it cannot always prevent further fracture. Some crowned teeth later need root canal treatment if the nerve becomes inflamed, and a crack that progresses into the root may eventually lead to extraction. We discuss these uncertainties honestly before you decide.
Why patients in Sanbon and Gunpo choose E&D Dental
- An intraoral camera that helps detect plaque, cavities and cracks, with images shared during the explanation
- Low-dose 3D CBCT imaging and UC ONE ultrasonic irrigation for root canal treatment in the same clinic
- A focus on keeping natural teeth where it is reasonable to do so
- Evening hours on Mondays and Thursdays and Saturday mornings, about 5 minutes on foot from Sanbon Station (Line 4)
International residents can ask about arranging English communication when booking. If biting causes sharp pain, contact Seoul E&D Dental Clinic to arrange an examination.