“…To improve the efficiency of TiO 2 as a bleach, Bulavinets and co-workers prepared Ag–TiO 2 NPs. As Ag is deposited in the TiO 2 NPs, the composite promotes surface plasmon resonance and enhanced electron-hole stripping activity, which increases the light-absorbing region in the visible region, resulting in improved bleaching activity of TiO 2 NPs as a bleaching agent [ 179 ]. In a follow-up study by Bulavinet and colleagues, Kurzman prepared a photoactivated teeth-whitening gel containing different concentrations of TiO 2 /Ag and compared the results with different concentrations of hydrogen peroxide gel.…”