Explain the role of mouth in digestion of food.

Explanation

### Step-by-Step Solution:

1. **Ingestion of Food**: The mouth is the first part of the digestive system where food enters. It serves as the entry point for food intake.

2. **Mastication (Chewing)**: The mouth contains teeth, which play a crucial role in the physical digestion of food. This process, known as mastication, involves the cutting and grinding of food into smaller pieces, making it easier to digest.

3. **Salivary Glands**: The mouth also houses salivary glands that produce saliva. Saliva is essential for the digestion process as it contains enzymes and helps in moistening the food.

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