It also helps explain why allergy season worsens oral health.
About 64% of U.S. households buy over-the-counter allergy medication. Every antihistamine — Claritin, Zyrtec, Allegra, all of them — causes dry mouth.
Saliva is your mouth's defense system. It remineralizes enamel,
neutralizes acid, flushes bacteria, and keeps the whole ecosystem in balance.
When medications suppress salivary flow, that balance collapses.
People with medication-induced dry mouth have 3X the risk of cavities. In other words, antihistamines essentially mimic the effects of mouth breathing.
Mouth breathing dries your tissues, shifts oral pH toward acidic, and creates an environment where harmful bacteria thrive and beneficial ones struggle. It's the same destructive cascade as medication-induced dry mouth, just arriving through a different door.