Which of the following is a risk factor for oral thrush?

• A. Inhaled corticosteroids with spacer
• B. Regular flossing
• C. Inhaled corticosteroids without spacer or mouth rinse
• D. Regular use of mouthwash

Answer: (C)

Inhaled corticosteroids can predispose to oral thrush because part of the medication deposits in the mouth and throat, temporarily suppressing local immune defenses and allowing Candida to grow more readily. Using a spacer reduces the amount that coats the oropharynx, and rinsing the mouth after inhalation washes away residual steroid. Together, these practices lower the risk of fungal overgrowth. Without a spacer or mouth rinse, more of the steroid remains in the mouth, increasing the chance of thrush. Regular flossing doesn’t impact Candida risk, and regular mouthwash use isn’t a driving factor for thrush in this context.