Eating pineapple tongue numbness is because pineapple contains pineapple protease, the oral mucosal tissues produce stimulation and have this performance. 1. Pineapple contains bromelain, which can break down proteins and produce strong stimulation to the oral mucosa and lip skin tissues, thus producing the symptoms of numbness and astringency of the tongue. 2. It is recommended to soak pineapple in lightly salted water for more than half an hour before eating it to reduce the content of bromelain before eating it. It is also not advisable to eat too much pineapple at one time, as discomfort or even swelling in the mouth may also occur if too much is eaten at one time. 3. If you already have symptoms of tongue numbness, use salt water or milk to gargle to neutralize the pineapple protease to relieve the symptoms. If the symptoms cannot be alleviated, allergy may be present and prompt medical attention should be sought.