The primary etiological factor for the development of root caries is

2 explanations

1. 

   Rolando90

   The answer here is wrong, should be poor oral hygiene

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2. 

   sharatpani

   No... please see https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114028/#:~:text=Factors%20like%20gingival%20recession%2C%20poor,lesion%20into%20the%20tooth%20structure. While both are factors the primary factor is gingival recession. You can have root caries even with good oral hygiene (eg. xerostomia due to drugs radiation etc) but you cannot have root caries without recession

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