MARK CLARKE / SCIENCE PHOTO LIBRARY MARK CLARKE / SCIENCE PHOTO LIBRARY
Tooth decay prevention (image 1 of 2). Dentist applying a chemical sealant to the teeth of a seven-year-old boy. The sealant will then be dried with ultraviolet light. Teeth coated with sealant are considered to be protected from tooth decay (dental caries). See photo M780/213 showing dentist drying the sealant.
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