The hardest constituent of tooth is

Options

A. Bone
B. Dentin
C. Enamel
D. Pulp

Answer

To solve the question "The hardest constituent of tooth is," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Bone
- B) Dentine
- C) Enamel
- D) Pulp

2. **Understand the Constituents of a Tooth**:
- **Bone**: This is not a direct constituent of the tooth itself but rather the structure that supports the tooth.
- **Dentine**: This is the layer beneath the enamel and is softer than enamel.
- **Enamel**: This is the outermost layer of the tooth and is known for its hardness.
- **Pulp**: This is the innermost part of the tooth, containing nerves and blood vessels, and is not hard.

3. **Analyze the Hardness**:
- Enamel is made up of 96% mineral content, primarily calcium phosphate, making it extremely hard and durable.
- Dentine, while also a hard tissue, is not as hard as enamel.
- Bone is hard but is not a direct component of the tooth structure.
- Pulp is soft and not hard at all.

4. **Conclusion**: Based on the analysis, the hardest constituent of the tooth is **C) Enamel**.

### Final Answer:
The hardest constituent of tooth is **C) Enamel**.

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