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After root canal treatment, the tooth loses its nutritional supply from the pulp, and thus, it cannot continuously receive calcium supply from the pulp. Consequently, the hardness of such teeth continues to gradually decrease. It is like a tree that loses its roots and slowly withers, becoming very brittle, leading to an increase in tooth fragility and susceptibility to fracture.

  Root canal treatment involves the use of medication and instruments to thoroughly clean and disinfect the remaining debris and bacteria inside the root canal. However, in order to perform this disinfection process thoroughly, a significant amount of infected tooth tissue must be removed, along with any remaining tooth tissue that must be trimmed. After disinfection, the tooth will be left hollow, and while the empty space will be filled with filling materials, these materials are insufficient to replace the tooth tissue and bear the stresses of normal function. If a complete tooth is like a fist that can withstand significant force, then a hollow tooth surrounded by weakened tooth tissue is like a hand with fingers spread apart, which may not be able to withstand the same amount of force and may result in tooth fracture. Therefore, most teeth that have undergone root canal treatment may not be strong enough to support normal chewing forces and may be at risk of fracturing. Material alone is not sufficient to restore function, and even if restored, the long-term results may not be favorable.

In addition, some patients with severe dental caries require full crown restoration to restore their bite and aesthetics.

The risk of dental fracture increases with decreased hardness and uneven stress distribution. In clinical practice, cases of dental fracture caused by these factors are common, and sometimes teeth that could have been saved need to be extracted. To prevent such situations, we recommend that patients undergo restoration as soon as possible after root canal treatment. In some cases, a post may be necessary to strengthen the tooth structure.