Some procedures can be done safely by reprogramming your pacemaker. If this is the case, careful follow-up for a period of time after the procedure is required to ensure that your pacemaker continues to work correctly. Powerful magnets, like those found in medical devices like MRI scanners, can seriously affect you pacemaker. You should discuss this with your doctor, and make sure all medical personnel are aware that you have a pacemaker prior to any procedure or test. Some pacemakers can be reprogrammed prior to the test so that the test can be performed safely.
Dental equipment appears to be safe for individuals with pacemakers.
X-rays used for diagnostic purposes do not appear to negatively affect pacemakers. The pacemaker should be shielded as much as possible during radiation therapy. Your pacemaker should be tested before and after any radiation therapy session, and in the period following treatment. If you have bipolar pacemaker, TENS units generally do not affect your pacemaker in a negative manner. If you have a unipolar pacemaker, a TENS unit can interfere with your pacemaker.