What are SECONDARY CARIES and how do they develop? Explore dentistry in 3D with VOKA Secondary caries, also known as recurrent caries, are decay lesions that develop at the margins of existing dental restorations—often around fillings, crowns, or inlays. These areas are especially vulnerable due to the interface between the tooth and restorative material. These lesions often begin as discoloration or minor staining, but beneath the surface, demineralization occurs at the enamel-restoration junct