Which term describes a type of caries characterized by rapid progression of demineralization, often with a narrow inlet and a large underlying cavity?

• A. Chronic caries
• B. Recurrent caries
• C. Acute caries
• D. Residual caries

Answer: (C)

Rapid progression caries patterns are defined by quick demineralization, where the decay moves through dentin faster than the tooth can mount protective responses. In this scenario, you often see a narrow entrance in the enamel but a sizeable cavity underneath in dentin—the decay has advanced more into the dentin than the surface enamel would suggest. The dentin tends to be soft and light in color because there hasn’t been time for sclerosis or reparative dentin to form. This matches the description of an acute, rapidly advancing lesion, commonly seen in children or in teeth with high caries activity. Chronic caries, by contrast, progresses slowly and shows more dentin sclerosis, a firmer texture, and a different pattern of color change, not the rapid, undermining expansion described here.