Study: NCT06426108

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Fluoride Varnishes
Description: the investigators will utilize a fluoride varnish with a concentration of 22,600 ppm F. The application will be facilitated using a microbrush, ensuring thorough coverage over the entire length of the lesion for a duration of 30 seconds. Following application, the varnish will be finished with water to create a film on the tooth surface. After completing the interventions, patients will receive instructions to refrain from consuming hard foods and to postpone tooth brushing for at least four hours, adhering to the manufacturer's recommendations.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Fluoride Varnishes
Description: the investigators will utilize a fluoride varnish with a concentration of 22,600 ppm F. The application will be facilitated using a microbrush, ensuring thorough coverage over the entire length of the lesion for a duration of 30 seconds. Following application, the varnish will be finished with water to create a film on the tooth surface. After completing the interventions, patients will receive instructions to refrain from consuming hard foods and to postpone tooth brushing for at least four hours, adhering to the manufacturer's recommendations.

Intervention type: DRUG
Group type: PLACEBO_COMPARATOR
Intervention: Varnishes placebo
Description: the investigators will apply a placebo varnish without the active ingredient (fluoride), ensuring that it is packaged identically to the fluoride varnish and has the same taste and texture, thus maintaining consistency in application. The varnish will be applied using a microbrush, spreading it evenly over the entire length of the lesion for a duration of 30 seconds. Following the interventions, patients will receive instructions to avoid consuming hard foods and to delay tooth brushing for at least four hours after applying the varnish.

Intervention type: DRUG
Group type: SHAM_COMPARATOR
Intervention: Varnishes placebo
Description: the investigators will apply a placebo varnish without the active ingredient (fluoride), ensuring that it is packaged identically to the fluoride varnish and has the same taste and texture, thus maintaining consistency in application. The varnish will be applied using a microbrush, spreading it evenly over the entire length of the lesion for a duration of 30 seconds. Following the interventions, patients will receive instructions to avoid consuming hard foods and to delay tooth brushing for at least four hours after applying the varnish.

Intervention type: RADIATION
Group type: ACTIVE_COMPARATOR
Intervention: Low-Intensity Laser 1J
Description: The tooth will undergo low-intensity laser irradiation in continuous mode, employing a wavelength of 808 nm, a power output of 100 mW, a dose of 1 Joule, and a fluence of 35 J/cm\^2. The laser will be positioned perpendicular to the tooth surface, targeting the cervical third of the buccal surface (both mesial and distal aspects), as well as the center of the lesion.

Intervention type: RADIATION
Group type: PLACEBO_COMPARATOR
Intervention: Low-Intensity Laser 1J
Description: The tooth will undergo low-intensity laser irradiation in continuous mode, employing a wavelength of 808 nm, a power output of 100 mW, a dose of 1 Joule, and a fluence of 35 J/cm\^2. The laser will be positioned perpendicular to the tooth surface, targeting the cervical third of the buccal surface (both mesial and distal aspects), as well as the center of the lesion.

Intervention type: RADIATION
Group type: EXPERIMENTAL
Intervention: Low-Intensity Laser 2J
Description: The tooth will undergo low-intensity laser irradiation in continuous mode, employing a wavelength of 808 nm, a power output of 100 mW, a dose of 2 Joules, and a fluence of 35 J/cm\^2. The laser will be positioned perpendicular to the tooth surface, targeting the cervical third of the buccal surface (both mesial and distal aspects), as well as the center of the lesion.

Intervention type: RADIATION
Group type: SHAM_COMPARATOR
Intervention: Low-Intensity Laser 2J
Description: The tooth will undergo low-intensity laser irradiation in continuous mode, employing a wavelength of 808 nm, a power output of 100 mW, a dose of 2 Joules, and a fluence of 35 J/cm\^2. The laser will be positioned perpendicular to the tooth surface, targeting the cervical third of the buccal surface (both mesial and distal aspects), as well as the center of the lesion.