I have to go under 12 x-rays in consecutive months for a thesis on horizontal impacted teeth. are 12 no. of x-rays dangerous.can they cause cancer.

Probably not: Radiation from dental x-rays is quite low, in particular with today's use of digital radiographs. However, any excessive radiation is not good. Over exposure of radiation could potenetially have serious consequences. The exact amount of radiation would depend on a number of factors including the film if used and the equipment that is used.

No: As long as you are wearing a protector shield there is no issues with the radiation.

Probable OK...: The amount of exposure depends on several factors, including the area of tissue exposed, and the type of equipment used (i.e. Standard x-ray, dental x-ray, ct). Age of the machine is also important, with newer ones typically having lower dose of radiation. Regardless, while you always want to minimize x-ray exposure, the cumulative dose would still likely be below levels known to cause cancer.

Dental X-Ray: You should address your concerns with those conducting the study but in short, it is highly unlikely this would be an issue. Chances are they are using digital x-rays but even the conventional x-rays for a full-mouth will expose you to about the same amount of radiation that a 1-2 hour airplane trip will. Pilots and flight attendants fly daily and have no higher rates of cancer!