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NGVB’s safety and effectiveness are well established.
Results are usually immediately noticeable, although they may be somewhat unpredictable.Moreover, in-office bleaching can often require multiple treatment sessions and, even without high heat, the high concentrations of peroxide may cause pulpal or soft tissue irritation, resulting in patient discomfort, either during or after the procedure.introduced nightguard vital bleaching (NGVB), or “dentist-prescribed at-home bleaching,” using 10% carbamide peroxide in custom-fitted trays as an alternative to the in-office technique.The higher gel concentration enhances peroxide diffusion through enamel, thus improving the whitening effect, while the lowered gel volume reduces the possibility of soft tissue irritation.OTC bleaching agents may indeed be a viable and satisfactory treatment option for many patients.As their carbon double bonds are broken (oxidized), the pigments lighten from their original yellow color to almost colorless.
Similarly, the lightening of darker discolorations caused by ingestion of chromagenic agents such as fluoride or tetracycline occurs by the same oxidative process.
Tooth whitening has enjoyed a tremendous increase in popularity in recent years and is now one of the most common cosmetic procedures performed in contemporary dental practice.
According to the American Dental Association’s 2003 nationwide public opinion survey of more than 1,000 adults, patients asked their dentists about tooth whitening more frequently than any other dental topic.
Over the next several decades, other bleaching agents, including oxalic acid, etherperoxide (Pyrozone), and hydrogen peroxide, were introduced.
Although the mechanism of action is not fully understood, tooth color change is believed to occur as a result of the breakdown of organic pigment by an oxidizing agent, eg, peroxide compounds.
NGVB remains the benchmark against which all other whitening techniques are measured.