The caries process demineralizes tooth structures, allowing _____ x-rays to pass through the tooth and _______ the image receptor

a. more, lighten
b. more, darken
c. less, lighten
d. less, darken

b. The caries process is one of demineralization of tooth structure (enamel, dentin, and cementum). This demineralization of tooth density allows more x-rays to pass through the tooth and darken the image receptor. Therefore, caries appear radiolucent on the radiograph.