Click button to select brush type. Circle indicates current brush size, opacity and hardness. Select desired correction type   Select preset to set optimal parameters for each particular case.   Select Advancedà to set parameters manually. To adjust brush size, drag slider. Draw over damaged area   Click and drag to make a stroke.   Each stroke will make teeth whiter. To view original image, hold . To undo / redo changes   To undo / redo last strokes, click / .   To cancel all changes, click .