This document discusses human ethics and dental ethics. It defines ethics as the study of what is right and good with respect to character and conduct. Dental ethics refers to the moral duties of dentists towards patients, colleagues, and society. Some key principles of dental ethics discussed are non-maleficence (do no harm), beneficence (do good), respect for patient autonomy, informed consent, justice, truthfulness, confidentiality, and codes of ethics. The document also outlines duties of dentists towards patients, colleagues, and the community, and provides examples of unethical practices.