Some People Have Allergic Reactions to Fluoride
In rare cases, exposure to fluoride can cause an allergic reaction, leading to symptoms such as hives, swelling, and difficulty breathing. Fluoride allergies are extremely rare and most commonly occur with topical exposure, such as through dental products rather than through ingestion. One of the most common signs of a fluoride allergy is itching or burning on the roof of your mouth after using products that contain the ingredient. People with fluoride allergies may also experience swollen, irritated gums and swelling of the tongue. If severe enough, tongue swelling can be fatal. Swollen or cracked lips, a rash around the mouth, and sores inside the mouth are other possible symptoms of an allergic reaction to fluoride. However, fluoride is not the only ingredient in toothpaste that can cause allergic reactions. It may be necessary to consult your dentist or doctor to determine what is responsible.