Participants will receive 1 hour before the surgery a placebo tablet, with the same physical and organoleptic characteristics, composed of corn starch, without harmful effects on health and simulating Dexamethasone (Celsius Laboratory, Montevideo, Uruguay).).

The irradiation simulations will be practiced in the same anatomical points described in the experimental group. This protocol will be carried out 1 hour before the surgical procedure (Baseline). The Laser device will be disconnected and its beep sound will be recorded and run on simulating the irradiation.

The patients will receive Dexamethasone 8 mg (Corodex, Laboratorio Celsius, Montevideo, Uruguay) PO 1 hour before surgery (Almeida et al 2019)

Pain sensitivity - The Visual Analogue Scale (VAS) is the most commonly used instrument for the assessment of postoperative pain in oral surgeries when FBM is used as post-surgical palliative therapy (Yüksek, Eroglu 2021, Momeni et al 2021, Amarillas -Escobar et al 2010, López-Ramírez et al 2011, Brignardello-Petersen et al 2012, Sierra et al 2013, Sierra et al 2015).

A rule will be used, graduated in cm, 10 cm long. One of the extremes represents "0", which means "no pain" and the other represents "10" which indicates "unbearable pain". The intermediate graduation gives patients the possibility of rating the intensity of their painful experience, from 0 to 10. This rule will be the same for all study participants and the indications for its use and marking will be given to the patient, always by the same operator

Pain sensitivity - The Visual Analogue Scale (VAS) is the most commonly used instrument for the assessment of postoperative pain in oral surgeries when FBM is used as post-surgical palliative therapy (Yüksek, Eroglu 2021, Momeni et al 2021, Amarillas -Escobar et al 2010, López-Ramírez et al 2011, Brignardello-Petersen et al 2012, Sierra et al 2013, Sierra et al 2015).

A rule will be used, graduated in cm, 10 cm long. One of the extremes represents "0", which means "no pain" and the other represents "10" which indicates "unbearable pain". The intermediate graduation gives patients the possibility of rating the intensity of their painful experience, from 0 to 10. This rule will be the same for all study participants and the indications for its use and marking will be given to the patient, always by the same operator

Amount of analgesics necessarily ingested, as a rescue: The amount of analgesic (Acetaminophen), a drug with a purely analgesic effect (Józwiak-Bebenista 2014) ingested by the patient (500 mg every 6 hours if the pain continues), will be recorded. At the beginning of the investigation, each patient will be given a form to record daily consumption, after the 3rd. post-operative day, and must be kept until the end of its use, at surgical discharge. At the end of the study, the amount of Acetaminophen tablets used will be evaluated as a secondary variable. The adherence of the participants to the study will be monitored through this means, asking the patients to present the form to verify its use.

Amount of analgesics necessarily ingested, as a rescue: The amount of analgesic (Acetaminophen), a drug with a purely analgesic effect (Józwiak-Bebenista 2014) ingested by the patient (500 mg every 6 hours if the pain continues), will be recorded. At the beginning of the investigation, each patient will be given a form to record daily consumption, after the 3rd. post-operative day, and must be kept until the end of its use, at surgical discharge. At the end of the study, the amount of Acetaminophen tablets used will be evaluated as a secondary variable. The adherence of the participants to the study will be monitored through this means, asking the patients to present the form to verify its use.

Evaluation of post-operative trismus- Spasms in the masticatory muscles (lockjaw) can limit or even prevent the normal opening of the mouth after surgical removal of impacted lower third molars (Yüksek, Eroğlu, 2021, López-Ramírez et al ., 2012; Aras; Güngörmüs, 2009; Aras; Güngörmüs, 2010; Amarillas-Escobar et al., 2010; Ferrante et al., 2013). This result is generally evaluated by measuring the distance between the incisal edges of the upper and lower central incisors, using a caliper, graduated in mm (millimeters) (Yüksek, Eroğlu, 2021, Sampaio-Filho et al., 2017 , Bauer et al. 2013).

Evaluation of post-operative trismus- Spasms in the masticatory muscles (lockjaw) can limit or even prevent the normal opening of the mouth after surgical removal of impacted lower third molars (Yüksek, Eroğlu, 2021, López-Ramírez et al ., 2012; Aras; Güngörmüs, 2009; Aras; Güngörmüs, 2010; Amarillas-Escobar et al., 2010; Ferrante et al., 2013). This result is generally evaluated by measuring the distance between the incisal edges of the upper and lower central incisors, using a caliper, graduated in mm (millimeters) (Yüksek, Eroğlu, 2021, Sampaio-Filho et al., 2017 , Bauer et al. 2013).

Evaluation of post-operative trismus- Spasms in the masticatory muscles (lockjaw) can limit or even prevent the normal opening of the mouth after surgical removal of impacted lower third molars (Yüksek, Eroğlu, 2021, López-Ramírez et al ., 2012; Aras; Güngörmüs, 2009; Aras; Güngörmüs, 2010; Amarillas-Escobar et al., 2010; Ferrante et al., 2013). This result is generally evaluated by measuring the distance between the incisal edges of the upper and lower central incisors, using a caliper, graduated in mm (millimeters) (Yüksek, Eroğlu, 2021, Sampaio-Filho et al., 2017 , Bauer et al. 2013).

Local temperature -To evaluate it a thermographic photograph of the facial skin in the operated area will be taken using a FLIR C5sc 9 camera (Teledyne FLIR, Wilsonville, Oregon, USA). . The quantification of the temperature will be carried out by means of the FLIR Research IR thermal analysis software. In all photographic records, the camera-patient distance will be kept constant, as will the ambient temperature of the place where the thermographic records are made.

Local temperature -To evaluate it a thermographic photograph of the facial skin in the operated area will be taken using a FLIR C5sc 9 camera (Teledyne FLIR, Wilsonville, Oregon, USA). . The quantification of the temperature will be carried out by means of the FLIR Research IR thermal analysis software. In all photographic records, the camera-patient distance will be kept constant, as will the ambient temperature of the place where the thermographic records are made.

Local temperature -To evaluate it a thermographic photograph of the facial skin in the operated area will be taken using a FLIR C5sc 9 camera (Teledyne FLIR, Wilsonville, Oregon, USA). . The quantification of the temperature will be carried out by means of the FLIR Research IR thermal analysis software. In all photographic records, the camera-patient distance will be kept constant, as will the ambient temperature of the place where the thermographic records are made.

Impact of the surgical procedure on the quality of life of patients - Two previously calibrated evaluators will ask patients to answer YES or NO to the following 10 questions, as described by Colorado- Bonin et al., 2006; Sato et al., 2009; savin; Grossi et al., 2007, Sierra et al. 2013, Sierra et al. 2015.

1. Are you maintaining your social activities normally?
2. Are you working and/or studying normally?
3. Are you maintaining a normal diet?
4. Do you have difficulty swallowing because of the surgery?
5. Do you have difficulty perceiving the taste of food?
6. Can you chew on the operated side?
7. Do you have difficulty sleeping because of the surgery?
8. Do you have difficulty speaking because of the surgery?
9. Has your physical appearance changed because of the surgery?
10. Are you angry about the surgery?

Impact of the surgical procedure on the quality of life of patients - Two previously calibrated evaluators will ask patients to answer YES or NO to the following 10 questions, as described by Colorado- Bonin et al., 2006; Sato et al., 2009; savin; Grossi et al., 2007, Sierra et al. 2013, Sierra et al. 2015.

1. Are you maintaining your social activities normally?
2. Are you working and/or studying normally?
3. Are you maintaining a normal diet?
4. Do you have difficulty swallowing because of the surgery?
5. Do you have difficulty perceiving the taste of food?
6. Can you chew on the operated side?
7. Do you have difficulty sleeping because of the surgery?
8. Do you have difficulty speaking because of the surgery?
9. Has your physical appearance changed because of the surgery?
10. Are you angry about the surgery?

Impact of the surgical procedure on the quality of life of patients - Two previously calibrated evaluators will ask patients to answer YES or NO to the following 10 questions, as described by Colorado- Bonin et al., 2006; Sato et al., 2009; savin; Grossi et al., 2007, Sierra et al. 2013, Sierra et al. 2015.

1. Are you maintaining your social activities normally?
2. Are you working and/or studying normally?
3. Are you maintaining a normal diet?
4. Do you have difficulty swallowing because of the surgery?
5. Do you have difficulty perceiving the taste of food?
6. Can you chew on the operated side?
7. Do you have difficulty sleeping because of the surgery?
8. Do you have difficulty speaking because of the surgery?
9. Has your physical appearance changed because of the surgery?
10. Are you angry about the surgery?

Dysphagia - The evaluation of dysphagia will be carried out through a questionnaire (Sampaio-Filho et al., 2017) that will classify on a numerical scale as follows:

(0)= total absence of dysphagia.

1. = dysphagia to solid foods.
2. = dysphagia to any food, liquid or solid.

Dysphagia - The evaluation of dysphagia will be carried out through a questionnaire (Sampaio-Filho et al., 2017) that will classify on a numerical scale as follows:

(0)= total absence of dysphagia.

1. = dysphagia to solid foods.
2. = dysphagia to any food, liquid or solid.

Dysphagia - The evaluation of dysphagia will be carried out through a questionnaire (Sampaio-Filho et al., 2017) that will classify on a numerical scale as follows:

(0)= total absence of dysphagia.

1. = dysphagia to solid foods.
2. = dysphagia to any food, liquid or solid.

The presence of hematoma/ecchymosis will be evaluated by measuring the largest diameter of the colorimetric changes in the skin of the jugal and submandibular region with a millimetric graduated malleable rule. The measurement will be carried out by the previously calibrated evaluator, who will classify the appearance of this finding into 4 categories:

1. non-existent;
2. the largest diameter is less than 4 cm;
3. the largest diameter is between 4 and 10 cm;
4. the largest diameter is greater than 10 cm; as described by Bjornsson et al., (2003).

The presence of hematoma/ecchymosis will be evaluated by measuring the largest diameter of the colorimetric changes in the skin of the jugal and submandibular region with a millimetric graduated malleable rule. The measurement will be carried out by the previously calibrated evaluator, who will classify the appearance of this finding into 4 categories:

1. non-existent;
2. the largest diameter is less than 4 cm;
3. the largest diameter is between 4 and 10 cm;
4. the largest diameter is greater than 10 cm; as described by Bjornsson et al., (2003).

The presence of hematoma/ecchymosis will be evaluated by measuring the largest diameter of the colorimetric changes in the skin of the jugal and submandibular region with a millimetric graduated malleable rule. The measurement will be carried out by the previously calibrated evaluator, who will classify the appearance of this finding into 4 categories:

1. non-existent;
2. the largest diameter is less than 4 cm;
3. the largest diameter is between 4 and 10 cm;
4. the largest diameter is greater than 10 cm; as described by Bjornsson et al., (2003).