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The aim of this study was to evaluate the effect of low‐level laser therapy (LLLT) on odontoblast‐like cells exposed to a bleaching agent. Mouse dental papilla cell‐23 cells were seeded in wells of 24‐well plates. Eight groups were established according to the exposure to the bleaching agent and LLLT (0, 4, 10 and 15 J cm−2). Enamel–dentin disks were adapted to artificial pulp chambers, which were...