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Prevention of Tooth Discoloration Using Fluoride Varnish Immediately After Bleaching.
Ryotaro Yago1, Chiharu Kawamoto1, Rafiqul Islam2
1Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
Journal of Functional Biomaterials
|July 25, 2025
Summary
Applying fluoride varnish immediately after tooth bleaching significantly reduces short-term tooth discoloration. This dental treatment protects enamel and aids remineralization, maintaining whitening results.
Area of Science:
- Dentistry
- Dental Materials Science
- Biomaterials
Background:
- Tooth bleaching is a popular cosmetic procedure.
- Bleaching agents can increase enamel roughness and porosity, leading to discoloration.
- Preventing immediate post-bleaching discoloration is crucial for esthetic outcomes.
Purpose of the Study:
- To evaluate the efficacy of fluoride varnish in preventing immediate enamel discoloration after tooth bleaching.
- To assess the impact of fluoride varnish on enamel surface morphology post-bleaching.
Main Methods:
- Bovine incisor specimens were bleached with 35% hydrogen peroxide.
- Treated specimens received Clinpro White Varnish (CW) or Enamelast Fluoride Varnish (EN); controls received no varnish.
- Samples were immersed in coffee, and color difference (ΔE₀₀) was measured using CIEDE2000.
- Enamel surface morphology was analyzed using Scanning Electron Microscopy (SEM).
Main Results:
- Fluoride varnish groups exhibited significantly lower color differences compared to the control group (p < 0.05).
- Both CW and EN varnishes reduced ΔE₀₀ by approximately two-thirds.
- SEM revealed reduced enamel surface irregularities in varnish-treated groups, indicating remineralization.
Conclusions:
- Immediate application of fluoride varnish post-bleaching effectively minimizes short-term tooth discoloration.
- Fluoride varnish offers physical protection and promotes enamel remineralization.
- This simple strategy can help maintain tooth whitening results and prevent early staining.
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