The correct term for the large groove teeth is molar teeth, and the loosening of molar teeth may be caused by periodontitis, apical periodontitis and other diseases, as follows. 1. Periodontitis: Periodontitis can lead to alveolar bone resorption, while the periodontal connective tissue attachment loss, the teeth of the periodontal support tissue is reduced, resulting in tooth loosening. It can be accompanied by symptoms such as bleeding gums or pus spillage. 2. Periapical inflammation: acute purulent periapical inflammation pus will collect in the periapical tissues, resulting in loosening of the teeth, mostly accompanied by significant pain, the teeth can be seen deeper caries or non-caries disease near the pulp. There may be other reasons for the loosening of the grinding teeth, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease and then targeted treatment.