Hydroxylapatite is widely used in biomedical applications due to its compatibility with human bone tissue. It is a key component in bone grafts and dental implants, promoting bone growth and integration. In dentistry, it is used in toothpaste and mouthwash to remineralize enamel and reduce sensitivity. Additionally, it serves as a coating for orthopedic implants to enhance their durability and biocompatibility. In drug delivery systems, hydroxylapatite nanoparticles are utilized for controlled release of therapeutic agents. It also finds applications in water treatment for removing heavy metals and contaminants due to its adsorption properties.