| ROUs | Recurrent oral ulcers |
| LLLT | Low-level laser therapy |
| NTP | Non-thermal plasma |
| RONS | Reactive oxygen and nitrogen species |
| ICNIRP | International Commission on Non-Ionising Radiation Protection |
| ATP | Adenosine triphosphate |
| DBD | Dielectric barrier discharge |
| VAS | Visual analog scale |
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