We are often asked whether we must take dental radiographs before dental treatment, and whether taking dental radiographs is harmful to the body. Here is a brief introduction. Teeth are the most mineralized organ of human body and the hardest organ of human body, so we can’t understand the comprehensive information just by the naked eye and simple clinical examination. If we want to understand the depth of tooth decay and its relationship with the pulp; the alignment and calcification degree of the internal pulp cavity and root canal of the tooth, the periapical lesion and the bone destruction of the periodontium, we must take dental radiographs. This is an important basis for treatment planning before treatment. It is usually good to get small radiographs for individual teeth, and it is possible that the radiographs will be reviewed during and at the end of treatment, which is necessary. As for the radiation dose of dental films and the damage to the body, an example will be clear to you. In fact, in Europe, many dental film machines are installed in the office, next to the dental chair, because the radiation dose is so low that even pregnant women can take dental films with the necessary protection. In addition, there is another kind of film that can see the whole mouth, we call it panoramic film, professionally called surface tomography, which may be needed before multiple teeth or blocked teeth, periodontal disease, orthodontics, implant treatment. The doctor will request these films if necessary.