Final answer:
Several techniques in dentistry can have adverse health effects on patients, including the use of fluoride, ionizing radiation, and chlorohexidine mouthwash.
Step-by-step explanation:
Several techniques in dentistry have been proven to cause adverse health effects on patients. One such technique is the use of fluoride in high levels, which can lead to dental and skeletal fluorosis. Another technique is the use of ionizing radiation, which was harmful in the past and caused serious health issues. Lastly, the use of chlorohexidine mouthwash can cause tooth surface discoloration, which can impact patients' compliance.