Like all healthcare practitioners, chiropractors undergo extensive education and training before receiving their doctorate degree and licensing. Prior to entering the doctorate program, students are required to master the core sciences such as chemistry, biochemistry, anatomy, physiology, pathology, and physics. Once in the doctorate program, students continue training into the advanced clinical sciences, including neurology, bacteriology, virology, radiology, toxicology, orthopedics, and differential diagnosis. Chiropractors do not practice medicine, but instead receive PhD-level education in nutrition. Students also receive extensive training on adjusting techniques and must complete clinical internships to perfect these skills. Lastly, all doctors of chiropractic must pass several rigorous board exams and state exams before obtaining their license.