The causes of wobbly teeth at the age of 40 include acute periapical periodontitis, alveolar abscess, the presence of large amounts of calculus, diabetes, high chewing pressure or trauma, etc., as follows: i. Acute periapical periodontitis: the root of the tooth constantly produces inflammatory secretions that destroy the alveolar bone, causing the affected tooth to emerge with a sense of floating and significant loosening. II. Alveolar abscess: pus overflows from the alveolar sockets of multiple teeth, widening the periodontal membrane gap and causing the teeth to loosen. Third, the presence of a large amount of calculus, pressure on the alveolar bone to occur vertical or horizontal resorption, gum recession, exposure of the roots, the teeth can appear 2-3 degrees of wobbling after the lack of hard tissue support. Fourth, diabetes: when suffering from diabetes and other systemic diseases, the alveolar bone resorption rate is faster and multiple teeth loosen at the same time. V. High chewing pressure or trauma: The teeth undergo periodontal shock and significant wobbling occurs.