Researchers report a gel that could both whiten teeth and reduce harmful oral bacteria, without the enamel damage linked to common bleaching methods. The gel is placed on teeth and then lit with green light, which triggers a cleaning and whitening reaction. Early tests on stained human teeth in the lab and in mice suggest the approach brightens tooth surfaces while disrupting plaque forming biofilms.
The material is a hydrogel, a soft water rich network that can hold active particles in place on the tooth. It contains tiny particles of bismuth oxychloride and cuprous oxide, which respond to green light. Unlike traditional whitening that relies on hydrogen peroxide and blue light, this method aims to be gentler on enamel and the surrounding tissues while still removing stains and bacteria.
In laboratory tests, the gel made stained teeth visibly lighter and left the hard surface intact. In mice, it reduced dental plaque and limited early cavity formation. These findings point to a possible brush free add on for oral care, although the authors note that the gel’s stickiness and long term stability still need improvement and that human studies have not yet been done.
ACS Applied Materials & Interfaces – Fast Cross Linked Hydrogel as a Green Light Activated Photocatalyst for Localized Biofilm Disruption and Brush Free Tooth Whitening – 2022
The research describes a sodium alginate hydrogel loaded with bismuth oxychloride and cuprous oxide nanoparticles. Under green light, it releases reactive species that break up biofilms and whiten teeth without measurable enamel damage in ex vivo tests, and it reduces plaque and early caries in mice.
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