Does it hurt to make up for serious caries?

For example, if the caries is only deep caries, no pulp lesions, no apical lesions, the pulp is alive, then in the caries, in the filling of teeth may show pain discomfort. If this caries is deep caries has led to dental pulp or apicitis, then this situation will definitely show pain when filling caries. Moreover, it is also impossible to directly fill teeth. Root canal treatment must be carried out first. only after root canal treatment can the teeth be filled. This is the correct treatment method.