DANB General Chairside Practice Test

Which factor would least likely contribute to xerostomia in a patient?

1. Dietary intake

2. Certain medications

3. Aging

4. Smoking

The correct answer is: Dietary intake

The choice indicating dietary intake as the least likely contributing factor to xerostomia is based on the understanding of how various influences affect saliva production. Xerostomia, or dry mouth, is primarily caused by reduced saliva flow, and several factors are known to significantly impact this condition. Certain medications, such as antihistamines, antidepressants, and diuretics, are well-recognized for their potential to cause dry mouth as a side effect. Aging is also a significant factor, as salivary gland function tends to diminish over time, leading to a higher prevalence of xerostomia among older adults. Smoking is known to alter the production and composition of saliva and is associated with various oral health issues, which can contribute to dry mouth. Dietary intake can influence saliva composition and flow, but it is not typically a direct cause of xerostomia. While a diet low in certain nutrients may affect oral health, it does not have the same immediate and pronounced effect on salivary gland function as medications, aging, and smoking do. Therefore, among the factors listed, dietary intake is the one that is least likely to contribute to the condition of xerostomia.