Tooth-whitening treatments in contemporary dentistry are often challenged by enamel demineralization and sensitivity. This study explores the potential of using Rochelle salt (potassium sodium tartrate), a piezoelectric material, as a non-invasive alternative to traditional peroxide-based whitening methods. While peroxide-based treatments eliminate extrinsic stains through chemical oxidation, Rochelle salt leverages its piezoelectric properties to produce controlled mechanical vibrations, thereby gently removing stains without damaging the enamel. This method is mechanically distinct from peroxide-based approaches.

In vitro experiments compared three toothpaste formulations: one without a whitening agent, one containing Rochelle salt, and one with peroxide carbamide as a control. Results demonstrated that the Rochelle-salt-enriched toothpaste was as effective as the peroxide carbamide-enriched formulation in removing stains. Specifically, the Rochelle salt formulation removed 30% of extrinsic stains after the equivalent of one week of brushing. Importantly, no enamel damage was observed following the long-term application of the Rochelle salt formulation. In contrast, the peroxide carbamide-enriched toothpaste reduced enamel microhardness by 16%, according to the Martindale test.

These findings indicate that Rochelle salt is a safe and effective alternative for eliminating tooth stains. However, further research is necessary in order to investigate the long-term effects of using this piezoelectric material in tooth-whitening treatments.