When treating a tooth, the dentist always strives to save the nerve. If the defect is small and does not reach the nerve, in most cases the doctor is sure that the entire carious lesion has been removed. However, if the defect is deep and reaches the nerve, there is a high probability that bacteria have already reached it. Root canal treatment is then performed to ensure that all the caries has been removed. However, the tooth is dead (the nerve has been removed). In intermediate situations, when the defect has been successfully cleaned, but a very thin layer separates it from the nerve, a filling can be performed. In such cases, however, it is possible that after treatment, the tooth hurts when biting, and it also reacts to cold and hot food and drinks (not sweet ones). This means that the bacteria responsible for the cavity have already penetrated deeper into the tooth, leading to inflammation of the nerve. In this case, the filling must be removed and the tooth treated with a root canal.
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