Which of the following is a listed cause of reduced salivary flow?

Which of the following is a listed cause of reduced salivary flow?

• A. Radiotherapy
• B. Regular exercise
• C. Vitamin D deficiency
• D. Mouth breathing

Answer: (A)

Reduced salivary flow happens when the glands that make saliva are damaged or unable to produce enough fluid. Radiotherapy to the head and neck is a well-known cause because radiation can injure the salivary gland cells and lead to long-lasting decreases in saliva production. This direct damage lowers the volume of saliva the glands can secrete, contributing to dry mouth and increased caries risk. Other options don’t typically reduce salivary production in the same way. Regular exercise isn’t a recognized cause of hyposalivation, though dehydration can temporarily reduce saliva if fluids aren’t replenished. Vitamin D deficiency doesn’t directly affect the glands’ ability to produce saliva. Mouth breathing can make mouth dryness feel worse due to evaporation of saliva, but it doesn’t inherently reduce the glands’ output.

Reduced salivary flow happens when the glands that make saliva are damaged or unable to produce enough fluid. Radiotherapy to the head and neck is a well-known cause because radiation can injure the salivary gland cells and lead to long-lasting decreases in saliva production. This direct damage lowers the volume of saliva the glands can secrete, contributing to dry mouth and increased caries risk.

Other options don’t typically reduce salivary production in the same way. Regular exercise isn’t a recognized cause of hyposalivation, though dehydration can temporarily reduce saliva if fluids aren’t replenished. Vitamin D deficiency doesn’t directly affect the glands’ ability to produce saliva. Mouth breathing can make mouth dryness feel worse due to evaporation of saliva, but it doesn’t inherently reduce the glands’ output.