Question 4:
_________ is Not a constituent of toothpaste.
[RRB NTPC 19th April 2016 Shift 1]
A. Abrasive
B. Fluoride
C. Lubricant
D. Surfactant
Answer:
The correct answer is C. Lubricant.
Detailed Solution:
Toothpaste is made up of several ingredients, each serving a specific purpose. Let’s take a look at the common components:
- Abrasive:
- Abrasives help in removing food particles, plaque, and stains from the teeth. Common abrasives include calcium carbonate and silica.
- Fluoride:
- Fluoride is added to toothpaste to strengthen tooth enamel and help prevent cavities. It is one of the most important ingredients for maintaining strong teeth.
- Surfactant:
- Surfactants create foam when you brush, helping the toothpaste spread evenly in your mouth. Sodium lauryl sulfate is a common surfactant used in toothpaste.
- Lubricant:
- Lubricants are not typically found in toothpaste. They are used in machinery and other products to reduce friction between moving parts, but they are not needed in toothpaste.
Since Lubricant doesn’t have any role in cleaning or protecting teeth, it is not a constituent of toothpaste.
