In recent years, reports of gel crystallization coinciding with gingival discoloration in cosmetic oral devices have raised concerns among both manufacturers and end-users. Could crystallized whitening gels be contributing to visible gum color changes? More importantly, is this merely a cosmetic issue, or does it indicate a deeper formulation or process flaw? This article addresses why this combination should not be ignored in modern teeth whitening product design. Understanding Gel Crystallization in Teeth Whitening Products Gel crystallization occurs when whitening agents (such as carbamide peroxide or hydrogen peroxide) solidify into crystalline structures within the gel matrix. This usually results from: Improper temperature control during storage. Incorrect formulation ratios. Inadequate sealing or packaging integrity. Crystallized gels no longer provide consistent spreadability and may deposit uneven concentrations of active ingredients on teeth and soft tissues. Gingival Discoloration: A Consequence or Coincidence? Gingival discoloration is typically observed as darkened or patchy areas on the gum tissue after repeated whitening treatments. Potential causes include: Overexposure to concentrated peroxide from crystallized gels. Irritant-induced capillary constriction. Inflammatory response to accumulated gel residues. When gel crystallization alters the intended application, active agents can pool at the gingival margins, leading to tissue stress and discoloration over time. Company…
