The gum recession examination method is one of the many periodontal examination methods, and is basically the same as the periodontal examination method, including the following ways: 1, visual examination: the physician observes with the naked eye whether the roots of the teeth are exposed; 2, probing: through special periodontal instruments, observe and measure the degree of gum recession; 3, imaging examination: through X-ray radiography examination to observe the degree of gum recession, as well as the ratio to the length of the entire root; 4, self-to-mirror examination: if you feel that your teeth have become longer, it may be gum recession.