This study was a double-blind study, in which neither the patient nor the surgeon and the researcher who measured the outcomes after LLLT were aware of the side that had received treatment. Only the operator who had applied the laser was aware of this information. The noise of the device was cut off during the exposures, so the patients were blinded to the side allocations.

The allocated groups were recorded on sealed and opaque envelopes. These cards were prepared by an independent person who was not involved in the study protocol. To explain, once the patient underwent tooth extraction and agreed to participate in this trial, the allocation assignment was revealed by opening the envelope by this independent person.

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