Influence of 35% hydrogen peroxide gel renewal on color change during in-office dental photobleaching with violet LED: a split-mouth randomized controlled clinical trial - Youssef, Shaddy A.; Cunha, Sandra Ribeiro; Santos, Eric Mayer; Brito, Sara Alves; Silva, Patrícia Moreira de Freitas Costa e; Ramalho, Juliana; Morimoto, Susana; Gonçalves, Flávia; Ramalho, Karen Muller (Photodiagnosis and Photodynamic Therapy, 2021)