It is worth mentioning that in GT samples, several authors, including our group, have found elevated levels of IL‐23 and IL‐17 in patients with periodontitis using the polymerase chain reaction (PCR) technique, enzyme‐linked immunosorbent assay (ELISA), and immunohistochemistry [11, 13, 14, 16]. The gene discussed is IL17A; the disease is periodontitis.