Scientists have developed a new toothpaste that shows potential to prevent severe allergic reactions in adults with peanut allergies.

An early-stage clinical trial tested whether 32 adults with peanut allergies could safely brush their teeth with the toothpaste, which contains trace amounts of peanut protein. The hope is that introducing small amounts of peanuts to the body over time will help the immune system get used to the allergen and reduce severe reactions.

Adults in the trial used the toothpaste once daily for about 11 months. At the end of the study, none of the participants experienced severe reactions or anaphylaxis — an allergic response often characterized by difficulty breathing, swelling in the throat, pale skin, blue lips, fainting or dizziness.