The paper studied the protective effect of collagen peptides on human periodontal ligament fibroblasts(hPDLFs)induced by lipopolysaccharide and its possible mechanism.The results showed that collagen peptides above 100 mg/mL could effectively reduce the toxicity of lipopolysaccharide,and significantly reduce IL-8 and TNF-α produced by lipopolysaccharide,suggesting that collagen peptides can provide effective and safe solutions to oral cavity repair.