Among the following varnish Which of the following has flouride concentration less than duraphat but having equivalent efficacy:
**Core Concept**
Fluoride varnishes are a type of topical fluoride application used to prevent dental caries and promote oral health. They contain various concentrations of fluoride, which can be adjusted to suit different patient needs and age groups.
**Why the Correct Answer is Right**
The correct answer is **B. Duraflour varnish** because it contains a fluoride concentration of 5% sodium fluoride, which is less than Duraphat (5% sodium fluoride) but has equivalent efficacy in preventing dental caries. Duraflour varnish works by releasing fluoride ions, which help to strengthen tooth enamel and make teeth more resistant to acid attacks from plaque bacteria.
**Why Each Wrong Option is Incorrect**
* **Option A:**
* **Option C:**
* **Option D:**
**Clinical Pearl / High-Yield Fact**
When choosing a fluoride varnish, consider the patient's age, dental health status, and the concentration of fluoride required to achieve optimal results. Always follow the manufacturer's instructions for application and dosage.
**Correct Answer: B. Duraflour varnish**