Inevitable problems were reported following the injection of local anesthesia in pediatric dental procedures, which can last until the elimination of soft tissue anesthesia.

Purpose of the study: To evaluate the effectiveness of diode laser photobiomodulation therapy on the reversal of soft tissue anesthesia (STA) in children following inferior alveolar nerve block anesthesia.

Inclusion Criteria:

• Patients in need of operative dental procedures, requiring inferior alveolar nerve (IANB) anesthesia.
• Healthy patients (physical status ASA I).
• Definitely positive or positive patients on the Frankl behavior scale.
• No reported allergies to LA, epinephrine or sulfites.
• Normal lip sensation before administration of LA

Exclusion Criteria:

• Patients requiring surgical procedures (i.e. extractions).
• Patients who will show excessive fear to the Transcutaneous Electric Nerve Stimulator (TENS) device and provide a false-positive response on inactivated electrode (absence of current) using the Venham scale.
• Patients who will not be trainable in the standardized lip tapping procedure (could not learn to distinguish the anesthetized numb side from the non-anesthetized side).
• Patients who will not achieve profound numbness after initial LA administration, requiring additional anesthesia using SEM scale.