Step 1: Concept
Sodium fluoride ($NaF$) is an inorganic salt widely used in preventative dentistry.
Step 2: Meaning
It acts as a source of fluoride ions to strengthen tooth enamel.
Step 3: Analysis
Fluoride ions help in the remineralization of teeth and make the enamel more resistant to acid attacks from plaque bacteria, thereby preventing dental caries (cavities).
Step 4: Conclusion
Because of its role in oral health, it is categorized as a dental product.
Final Answer: (A)