BmKn-2 peptide kills oral cancer cells by triggering programmed cell death. BmKn-2 peptide does not affect cell viability in normal oral cells. BmKn-2 peptide does not mediate apoptosis in healthy of oral cells. Oral cancer cells undergo apoptosis via the intrinsic pathway by BmKn-2. BmKn-2 peptide shows great promise as a candidate treatment for oral cancer.