What is the primary reason why root caries is becoming more prevalent?

Question

Quizplus · Accepted Answer

Root caries are becoming more prevalent because people are living longer and are keeping their teeth longer,and older people often take many medications that may cause xerostomia.
People may be consuming more fermentable carbohydrates,but that is not the primary reason why the prevalence of root caries is increasing.
Better diagnostic methods is not the reason for an increase in the prevalence of root caries.
The presence of fluoride reduces root caries.

What Is the Primary Reason Why Root Caries Is Becoming