Table 3.

The outcomes of the included studies

Study ID	Outcomes	P	Significance
Nabi et al.[18]	PMB can be an effective alternative to the conventional use of NSAIDs in controlling postendodontic pain	0.044	Significant
Morsy et al.[31]	Intracanal diode laser irradiation can decrease the postoperative pain after conventional RCT in cases of necrotic teeth with periapical lesions	<0.001	Significant
Doğanay Yıldız and Arslan[16]	PMB can be beneficial in reducing postoperative pain in endodontics	0.037	Significant
Ramalho et al.[32]	The application of 780-nm diode laser irradiation at 4 and 40 J/cm2 showed no effect in reducing pain. The influence of 4 J/cm2 showed a negative effect on local anesthetics, resulting in a significant increase in complimentary local anesthesia	0.056	NS
Arslan et al.[15]	PMB may reduce postoperative pain after RCT of mandibular molar (on first 4 days)	<0.05	Significant
Coelho et al.[33]	Photodynamic therapy was efficient in reducing postoperative pain in single-visit RCT of teeth with necrotic pulps	0.036	Significant
Lopes et al., (2019)[17]	The PBM therapy reduces the prevalence of postoperative pain	0.04	Significant
Barciela et al.[34]	The pain between the control and laser groups was equivalent	0.28	NS

NSAIDs: Nonsteroidal anti-inflammatory drugs; RCT: Root canal therapy; PMB: Photobiomodulation; NS: Not significant