MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Plaque removal. Dentist (left) removing dental plaque from a patient's teeth using a high-pressure water jet. The dental nurse is operating a suction device to remove this water from his mouth. If allowed to build up, dental plaque, a substance formed from food particles, saliva and bacteria, can lead to inflammation of the gums, or gingivitis.
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