Why is caries risk increased in patients with asthma and allergies?

Why is caries risk increased in patients with asthma and allergies?

• A. They are often on medications that dry salivary secretions
• B. They have increased saliva production
• C. They receive excessive fluoride
• D. They brush too often

Answer: (A)

The main idea is that saliva protects teeth, so when saliva flow is reduced, caries risk rises. In asthma and allergy patients, the medications they often use—especially inhaled therapies—can cause xerostomia (dry mouth). With less saliva, the mouth’s buffering capacity drops, sugars aren’t washed away as effectively, and the environment shifts toward acid-producing bacteria, all of which promote demineralization and caries. Nasal allergies can also lead to mouth breathing, which further dries the mouth and adds to the risk. That’s why medication-induced drying of salivary secretions best explains the increased caries risk. The other possibilities don’t fit as well: more saliva would lower risk, excessive fluoride would protect, and brushing too often isn’t a typical cause of increased caries risk.

The main idea is that saliva protects teeth, so when saliva flow is reduced, caries risk rises. In asthma and allergy patients, the medications they often use—especially inhaled therapies—can cause xerostomia (dry mouth). With less saliva, the mouth’s buffering capacity drops, sugars aren’t washed away as effectively, and the environment shifts toward acid-producing bacteria, all of which promote demineralization and caries. Nasal allergies can also lead to mouth breathing, which further dries the mouth and adds to the risk. That’s why medication-induced drying of salivary secretions best explains the increased caries risk. The other possibilities don’t fit as well: more saliva would lower risk, excessive fluoride would protect, and brushing too often isn’t a typical cause of increased caries risk.