Which part of a tooth often becomes thinner over time due to brushing, teeth grinding, and consumption of acidic foods?

• A. Enamel
• B. Dentin
• C. Pulp
• D. Cementum

Answer: (A)

Verified step by step guidance

1. Understand the structure of a tooth: A tooth is composed of four main layers—enamel, dentin, pulp, and cementum. Each layer has a specific function and composition.
2. Learn about enamel: Enamel is the outermost layer of the tooth and is the hardest substance in the human body. It protects the inner layers of the tooth from damage and decay.
3. Identify factors that affect enamel: Enamel can become thinner over time due to mechanical wear (e.g., brushing too hard or teeth grinding) and chemical erosion (e.g., consumption of acidic foods and beverages). Unlike other tissues, enamel cannot regenerate once it is lost.
4. Compare enamel to other layers: Dentin lies beneath the enamel and is softer, making it more susceptible to damage once enamel is worn away. Pulp is the innermost layer containing nerves and blood vessels, while cementum covers the root of the tooth and anchors it to the jawbone.
5. Conclude that enamel is the correct answer: Based on its location and susceptibility to wear and erosion, enamel is the part of the tooth that often becomes thinner over time due to brushing, grinding, and acidic foods.