The big tooth is rotten and empty and smells bad, which is caused by serious caries. In this case, you should go to the hospital in time to have a specialist examination and take dental X-ray to determine the extent of caries and whether it can be preserved. If the caries is not damaged to below the gum or root bifurcation, the affected tooth can be preserved through systematic endodontic treatment and restored later to restore the shape and function of the tooth, restore the integrity of the tooth and continue to exercise the chewing function. If the scope of caries has reached below the gum or root bifurcation, the caries can not be preserved and must be extracted. After extraction, it takes three months for the alveolar bone and soft tissue to heal completely before restoration treatment can be carried out to restore the integrity of the tooth and chewing function.