We often need to take dental radiographs when we do root canal treatment in the clinic, but sometimes we encounter patients who are preparing to get pregnant and those who are already pregnant. For patients who are pregnant, it is recommended to take dental radiographs one month after the radiographs are taken to prepare for pregnancy. For patients who are pregnant and need dental radiographs, they should be taken after 3 months, and they should take precautions to avoid it if possible. The following quote: For oral radiation, there are two wrong tendencies to avoid: 1. being too nervous and afraid, and 2. ignoring its hazards. Both are a sign of not knowing radiology. First, any dose of radiation is harmful, and any oral radiation requires specific protection (including portable ones that claim to be microfocal). Protection should include protection for the practitioner, the patient and the environment. Rules bylaws may vary from country to country. Common lack of protection concepts include: pressing the dental piece with the finger (to be prohibited by the practitioner, the patient should use the holder if possible), not understanding lead aprons, and mistakenly believing that portable does not require protection. Secondly, the harm caused by a certain dose of radiation is reversible, and the doctor weighs the pros and cons and takes the film when it is more beneficial than harmful to the diagnosis and treatment. Overly conservative ideas are: pregnancy or even preparing for pregnancy is prohibited to take pictures (pregnancy is not an absolute contraindication to oral x-ray, can choose to take pictures to avoid the first three months, routine protection is the key to do). It is better to play Tai Chi with patients and avoid disputes than to promote science to patients and let them decide and sign the “informed consent”. North America often give new patients, caries, periodontal disease to take 18-21 full mouth films full mouth series (FMS). I also felt that it was wasteful, dangerous and unbelievable when I first came out of the country. But when you look at the dosage, you can see that this worry is unnecessary. The sky, sunlight, and terrestrial radioactive elements all have radiological hazards to the human body. The amount of this radiation received each year is 400 times that of a small dental film. That is, you also eat at least the amount of radiation from nature in one dental tablet per day without taking dental veneers. (See: American Dental Association ADA data on radiation dose, see table below) The potential threat to life from a 2.5 mile bike ride is equal to the potential for death from a fatal cancer caused by a single dental tablet (19 dental tablets = 30 miles of biking according to the American textbook. This is just a reference, see dental radiopraphy, Joen M., editor-in-chief)