It is not always necessary to fill a black tooth, but it is important to identify the cause of the blackening of the tooth, because sometimes it is not always the endogenous caries that causes the blackness, but the exogenous pigmentation that causes the blackness of the tooth surface. This is often seen in bad habits, such as smoking or eating colored food, and also in people who drink tea regularly, which can also lead to obvious tea stains on the corresponding tooth surface and lead to the darkening of the teeth. For the exogenous staining, it is not necessary to repair the tooth, and the exogenous staining can be removed well by sandblasting and polishing, but if it is confirmed that there is bacterial infection inside the tooth and indeed there is tooth decay, in this case, it is necessary to carry out early decay and filling repair treatment.