IL17A and periodontitis: The analysis indicated a significant positive correlation between Bacteroides and the abundance of γδ T, while Lactobacillus was significantly negatively correlated with the abundance of γδ T. During the targeted inhibition of γδ T in the treatment of OSCC with periodontitis, the abundance of the beneficial intestinal bacteria (30) Lactobacillus increased, which was significantly correlated with the IL-17 protein concentration and γδ T cell abundance.