Dental hygienists use a variety of tools and devices to perform daily tasks. A range of instruments are used to help remove plaque and stains, including air-polishing tools and ultrasonic devices. As technology continues to advance, lasers are showing up next to the patient chair more frequently, and dental hygienists must be trained in proper usage of these tools. They must also be well-versed in radiography when using certain types of x-ray equipment. Although state-by-state requirements vary, many dental hygienists counsel patients on how different foods affect oral health and provide advice on proper techniques for care.