Influence of pH on the Effectiveness of Hydrogen Peroxide Whitening

Abstract

The efficacy of hydrogen peroxide bleaching is directly proportional to the increase in its pH.

Effect of pH on whitening efficacy of 35% hydrogen peroxide and enamel microhardness

“…The reaction is an oxy‐reduction, which generates the optical effect of whitening because the light absorption by the chromogens is reduced. Factors that can influence the efficacy of the peroxide include temperature, the presence of metal salts, incident light, and pH …”

“…The pH value of the H 2 O 2 influences the bleaching effect. Some substrates, including wine, tobacco, cotton, wood pulp, fabrics, or solutions with chromogen agents have improved whitening with alkaline H 2 O 2 . Moreover, previous studies have reported that H 2 O 2 at a higher pH decreased deleterious effects on the enamel surface, including demineralization, loss of the aprismatic layer, calcium loss, and an increase in surface roughness .…”

“…Moreover, previous studies have reported that H 2 O 2 at a higher pH decreased deleterious effects on the enamel surface, including demineralization, loss of the aprismatic layer, calcium loss, and an increase in surface roughness . However, the increased shelf‐life of H 2 O 2 ‐based products and the stability of the H 2 O 2 molecule require a lower pH …”

Influence of solutions with pigmentation potential on tooth color after bleaching using 22% carbamide peroxide

“…Furthermore, the action of carbamide peroxide and color stability differs significantly from hydrogen (LIMA et al, 2009). Another factor to be considered is the pH of the bleaching agent, since the effectiveness of hydrogen peroxide is directly proportional to the pH increase (TORRES et al, 2014). The present study may contribute to the understanding of the mechanisms of pigmentation during dental bleaching, but it is known that other factors as mentioned above also influence bleaching procedures.…”

Effect of different storage conditions on the physical properties of bleached enamel: An in vitro vs. in situ study

“…These free radicals oxidize pigment molecules, turning them into less complex molecules, leading to a whitened aspect of the teeth. [1][2][3] Although there are no doubts with regards to the effectiveness of in-office bleaching, the safety of this technique on the tooth structure has been questioned. 4 Negative effects have been associated with dental bleaching and could be related to the pH value, oxidative effect or composition of the bleaching agents.…”