There was a medical check-up of teeth of a particular class in a school. It was found that some students had cavities in their teeth. The teacher asked them two questions. First, how many chocolates or sweets do they eat? Second, which toothpaste do they use for brushing their teeth, i.e., does it contain fluoride or not?
After reading the above paragraph, answer the following questions :
(b) What is the limiting value of the fluoride that should be present in the toothpaste? What happens if this limit is exceeded?

Explanation

To answer the question regarding the limiting value of fluoride that should be present in toothpaste and the consequences of exceeding this limit, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding Fluoride in Toothpaste**:
- Fluoride is a mineral that helps to strengthen teeth and prevent cavities. It is commonly added to toothpaste for its dental benefits.

2. **Limiting Value of Fluoride**:
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