Trace Elements in Oral Biology and Dental Practice: Molecular Mechanism and Clinical Applications

Abstract

In oral biology, trace elements are crucial because they affect the host immune system, microbial ecology, salivary function, and the structural integrity of tooth tissues. Fluoride, zinc, copper, selenium, iron, manganese, and other elements are involved in the mineralization of dentin, the development of enamel, antioxidant defense systems, and enzymatic control. These micronutrients influence the onset and course of dental caries, periodontal diseases, and disorders of the oral mucosa by modifying signaling pathways, gene expression, collagen formation, and oxidative stress responses at the molecular level. While fluoride encourages remineralization and inhibits demineralization by producing fluorapatite, zinc and copper boost antibacterial activity and matrix metalloproteinase regulation. Manganese and selenium protect oral tissues from damage from reactive oxygen species because they are cofactors for antioxidant enzymes. Both an excess and a deficit of trace elements can disrupt oral homeostasis, which can lead to reduced enamel, delayed wound healing, altered salivary composition, and increased susceptibility to infection. Trace elements are used in clinical practice for a variety of prophylactic and therapeutic purposes, including dental implants, bioactive restorative materials, fluoride products, and adjunctive periodontal therapy. Recent research shows their potential in nanotechnology-based drug delivery systems and regenerative dentistry. This review covers the most recent studies on the molecular mechanisms and clinical applications of trace elements in dentistry, with an emphasis on their dual role in maintaining dental health and causing disease when out of balance. Understanding these linkages is the foundation for developing targeted therapeutic and preventive approaches in modern dentistry.