CHRIS KNAPTON / SCIENCE PHOTO LIBRARY CHRIS KNAPTON / SCIENCE PHOTO LIBRARY
Tooth decay and implants, dental model. Close-up of four teeth in the left lower jaw of a human. This model has transparent gums, showing the roots of the teeth. From far right, the teeth and their conditions are: first molar (cracked; tooth decay, black; infected root and inflamed nerve pulp, red), second pre-molar (filled with a dental metallic-looking filling), first pre-molar (has been replaced with a screw-based implant), canine (healthy). Tooth decay is caused by acid-secreting bacteria feeding on food debris in the mouth. The infected area can be drilled out and filled, or the tooth can be replaced completely.
Model release not required. Property release not required.