Which statement correctly describes acid dissolution in coronal caries according to the material?

• A. Slower under low pH
• B. Faster under low pH
• C. Slower under high pH
• D. Faster under high pH

Answer: (A)

The main idea here is how pH influences the pace of mineral loss in a coronal caries lesion as described in the material. According to the material, the dissolution process proceeds more slowly when the environment is more acidic (low pH). This reflects the idea that, in this specific context, factors like the formation of a partially demineralized surface layer and the buffering actions of saliva and remineralization processes can temper the net rate of mineral loss even under acidic conditions. In other words, the described pattern emphasizes a slower acid dissolution under low pH, rather than a faster rate, which is why that statement is considered the best match for the material. The other options conflict with this described pattern by implying that acidity (low pH) speeds dissolution or that neutrality/alkalinity (high pH) does.