FOR IMMEDIATE RELEASE
ACS News Service Weekly PressPac: September 08, 2021
Whiter teeth, without the burn聽
ACS Applied Materials & Interfaces
Most people would like to flash a smile of pearly whites, but over time teeth can become stained by foods, beverages and some medications. Unfortunately, the high levels of hydrogen peroxide in dentists鈥� bleaching treatments can damage enamel and cause tooth sensitivity and gum irritation. Now, researchers reporting in聽ACS Applied Materials & Interfaces聽have developed a gel that, when exposed to near infrared (NIR) light, safely whitens teeth without the burn.
The growing demand for selfie-ready smiles has made tooth whitening one of the most popular dental procedures. Treatments at a dentist鈥檚 office are effective, but they use high-concentration hydrogen peroxide (30鈥�40%). Home bleaching products contain less peroxide (6鈥�12%), but they usually require weeks of treatment and don鈥檛 work as well. When a bleaching gel is applied to teeth, hydrogen peroxide and peroxide-derived reactive oxygen species (mainly the hydroxyl radical) degrade pigments in stains. The hydroxyl radical is much better at doing this than hydrogen peroxide itself, so researchers have tried to improve the bleaching capacity of low-concentration hydrogen peroxide by boosting the generation of powerful hydroxyl radicals. Because previous approaches have had limitations, Xingyu Hu, Li Xie, Weidong Tian and colleagues wanted to develop a safe, effective whitening gel containing a catalyst that, when exposed to NIR light, would convert low levels of hydrogen peroxide into abundant hydroxyl radicals.
The researchers made oxygen-deficient titania nanoparticles that catalyzed hydroxyl radical production from hydrogen peroxide. Exposing the nanoparticles to NIR light increased their catalytic activity, allowing them to completely bleach tooth samples stained with orange dye, tea or red dye within 2 hours. Then, the researchers made a gel containing the nanoparticles, a carbomer gel and 12% hydrogen peroxide. They applied it to naturally stained tooth samples and treated them with NIR light for an hour. The gel bleached teeth just as well as a popular tooth whitening gel containing 40% hydrogen peroxide, with less damage to enamel. The nanoparticle system is highly promising for tooth bleaching and could also be extended to other biomedical applications, such as developing antibacterial materials, the researchers say.
The authors acknowledge funding from the聽, the National Key R&D Program of China and the Key Technologies R&D Program of Sichuan Province.
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