When a big tooth is rotten and only the root is left, usually, it needs to be extracted and then restored with a denture, but if the root is still in good condition after checking, it can be retained and then root canal treatment can be done.
Large teeth are also known as molar teeth, molar teeth serious caries if not treated in time, will decay to the root of the tooth, resulting in root inflammation, if the inflammation is more serious, the root of the tooth is too short according to the situation need to be extracted as soon as possible and then prosthetic restoration, to prevent inflammation from spreading to the neighboring teeth.
If the caries decay to the root of the tooth, radiographic examination of the remaining length of the root of the tooth is good, the pulp chamber bottom is intact after examination, can be considered to do root canal treatment, retaining the root of the tooth, and later on for the pile core crown repair.
When tooth decay occurs, it is recommended to seek medical treatment as soon as possible to avoid excessive loss of tooth tissue or even extraction.