The strong magnetic field properties of magnets have led to their use in many modern technologies, as well as in the fields of medicine and dentistry. Strong Neodymium Magnets are a powerful type of magnet that has been the subject of recent research. This review provides a brief explanation of the definition, history, and characteristics of rare earth magnets. In addition, a broad overview of results obtained in studies performed to date on the effects of magnets, and neodymium magnets in particular, on body systems, tissues, organs, diseases, and treatment is provided. Though they are used in the health sector in various diagnostic devices and as therapeutic tools, there is some potential for harmful effects, as well as the risk of accident. The research is still insufficient; however, neodymium magnets appear to hold great promise for both diagnostic and therapeutic purposes.

　　Keywords: Health, magnet, neodymium

　　Neodymium is a chemical element that was discovered in 1885. This element (atomic number 60) has a silvery-white metallic color and belongs to the group of lanthanides, which is a subgroup of rare earth elements (atomic numbers 57–71) in the periodic table and rapidly oxidizes in air. Lanthanides play important roles in new technological developments, such as wind turbines, electronic hybrid vehicles, and in the defense industry.

　　In nature, neodymium does not exist in metallic or in mixed forms with other lanthanides but is refined for general use and has been mined in the USA, Brazil, India, Australia, Sri Lanka, and predominantly in China.

　　Neodymium-iron-boron magnets were developed by General Motors and Hitachi in the 1980s. Because it provides high magnetic force even in lesser amounts, it has been increasingly given a more prominent role in the manufacture of strong permanent magnets made up of rare earth elements. In the field of information technology, neodymium magnets are particularly used in hard disc drives, mobile phones, video and audio systems of television .

　　Neodymium magnets are also commonly used in magnetic separators, filters, ionizers, in production of on–off buttons, safety sector and security systems. Grease filter producers use neodymium magnets in metal separators to more effectively filter out iron powder in oil. Additionally, they are beneficial in covering machines, cars with awning and in the production of magnetic tool belts. They are also used in jewelry clips, identification badges and in the production of baby strollers that are attached to carriers via magnets.

　　The health sector is another field where neodymium magnets are incorporated in medical devices for example in magnetic resonance imaging devices to diagnose and treat chronic pain syndrome, arthritis, wound healing, insomnia, headache, and several other diseases due to their ability to generate a static magnetic field. An increase in their usage has been observed over the last decade .These magnets are thought to have a curing effect and are therefore sometimes called “magic magnets”.

　　NASA uses neodymium magnets to maintain the muscular tonus of astronauts during space flights

　　Neodymium magnets have push–pull forces and have been used as a motion-generating device in orthodontic treatments; molar distillation, and palatal expansion .

　　Static magnetic field has been reported to stimulate bone formation via osteoblastic differentiation or activation .

　　The amount of neodymium magnets used in all these areas has risen from 1 ton to 60.000 tons between 1983 and 2007. Since 1990, China has been predominant in the mining of rare earth elements. The mining of rare elements has various environmental and Ndfeb Magnet Price impacts because of the low concentration of these substances; therefore, many countries have stopped the mining of rare elements and almost all countries depend on imports from China .