Purpose we examined the change of function and pain by improvement of the temporomandibular joint during low-level laser(LLL) and transcutaneous electrical nerve stimulation(TENS) to adults who show temporomandibular disorder. Methods This study was conducted with temporomandibular disorders. Participants were randomly divided into two group (LLL vs TENS). The TENS was applied at a frequency of 4Hz and intensity for 15 minutes. The LLL was applied with a power of 40㎷ per laser at 685nm wavelength in continuous wave mode. This study were conducted three times a week for a total of 4 weeks. Results The LLL was associated with more significant improvements in mouth opening (p<0.01, 95% CI: 1.910-7.023), and masticatory muscle pressure threshold(p<0.05; 95% CI: 0.027-0.943). Conclusion Our findings indicate that LLL was more effective than TENS in the treatment of TMD. Such findings highlight the need to develop and promote a controlled therapy program to facilitate a return to normal daily activities in patients with TMD.