Allergies, allergy medication and oral health

July 2nd, 2025



Young woman blows her nose into a tissue after experiencing allergies. There are leafy plants in the background to indicate pollen as a cause for the allergy symptoms.

It’s allergy season

Seasonal allergies come in many different forms and with an array of symptoms. Some can directly impact oral health.

Nasal congestion or a stuffy nose is a very common symptom of allergies, along with frequent sneezing. Because breathing through the nose is difficult, mouth breathing increases, especially at night, which can cause snoring and dry mouth (more on this symptom in the next section). Nasal dripping, dry mouth, and coughing can also result in a sore throat.

Gums can become swollen, red, or painful due to the body's immune response to allergies. Be gentle with gums when experiencing allergy symptoms to avoid bleeding or infection.

Treating allergies

Many people who suffer from seasonal allergies take medications called antihistamines. While very effective at treating allergy symptoms, these medications can come with side effects that also impact our oral health.

Illustration of a mouth with the tongue sticking out. The tongue is cracked due to dry mouth. There is a cracked desert floor at the bottom of the picture.

The main side effect of antihistamines is dry mouth; medications, both prescription and over-the-counter, are common causes. Dry mouth, also known as xerostomia, occurs when the salivary glands do not produce enough saliva to keep the mouth moist. Antihistamines can cause this slowdown in saliva production. Saliva plays a major role in lubricating the mouth, making it easier for us to chew, swallow, and speak. Saliva also plays an important role in neutralizing acid on our teeth and helping to prevent tooth decay and gum disease.

Illustration of a medical professional wearing a lab coat and stethoscope. He is smiling and holding up a toothbrush and a tube of toothpaste.

If you experience dry mouth, speak with your doctor about changing medications, as this can usually quickly resolve the symptom.

If changing medications does not work or is not an option, then steps must be taken to decrease the negative effects of dry mouth. This would be a good time to contact your dentist or dental hygienist to see what options are available. Your dentist may recommend a prescription fluoride paste for you to use or possibly suggest more frequent cleanings.

Prescription mouthwash to treat dry mouth.

To relieve a sore throat, you can gargle with warm salt water. You can also use cough drops to soothe your throat and reduce coughing, but try to find a brand that is sugar-free. If you use a cough drop with sugar, rinse your mouth with water and brush your teeth after you finish it.

In general, the best way to keep yourself healthy is with prevention. This includes making healthy diet choices with lots of fruits and vegetables, drinking plenty of water, and getting rest. To keep your smile healthy, be sure to brush, floss, and keep up on routine dental visits.


This information in this post is for general educational purposes only and does not warrant or represent any information as related to health as specifically appropriate for you. It is not intended to be medical advice or replace the relationship that you have with your health care providers. You should always seek medical advice on any diagnosis or treatment from a qualified health care provider. The information is provided “as is” without any representations or warranties, express or implied.