Photobiomodulation Before or After Tooth Whitening

The objective is to evaluate the effect of photobiomodulation (PBM) applied before or after in-office tooth whitening in reducing tooth sensitivity (TS) and color change. Sixty-six patients aged between 18 and 28 years old, of both sexes, with good oral and general health will be selected for the study. A randomization process will be carried out to allocate participants into the three different groups: FBM-Before, FBM-After and Placebo. All groups will undergo in-office whitening treatment with 35% hydrogen peroxide (Whitness HP, FGM, Joinville, SC, Brazil). Three whitening sessions will be carried out, considering a seven-day interval between sessions. TS will be measured using a visual analogue scale (VAS) and a five-point numerical rating scale (NRS), while shade change will be assessed using a spectrophotometer: before the bleaching treatment (T0), after the first (T1), second (T2). ) and third (T3) weeks of treatment and 30 days (T4) after the end of the bleaching treatment.