Some teeth have cracks that are too small to show up on X-rays. Sometimes the cracks are under the gum. These small cracks are known as “cracked tooth syndrome.”

Cracked tooth syndrome is most common in lower back teeth (molars). That’s because these teeth absorb most of the forces of chewing.

Some people grind or clench their teeth. These people may be more likely to have cracked tooth syndrome. Sometimes, the way a person’s teeth come together can put too much pressure on one tooth. This can cause the teeth to crack.

Teeth with large fillings may be more likely to crack. Teeth that have undergone root canal treatment are weaker than other teeth and also may be more likely to crack. People with one cracked tooth are more likely to have others, either at the same time or in the future.

Click here to learn about the diagnosis of and treatment for cracked tooth syndrome at colgate.com.