Hello, You may have dehydrated the tongue especially since they were salted. Other possibilities are an allergic type of reaction, inadequate hygiene, gastric disturbances or an infection such as a yeast infection. Make sure you are well hydrated and have balanced vitamins. Gentle daily dental care should include brushing your tongue and rinsing. Adjust your diet for the next few days to avoid irritants such as salty, acidic and spicy foods. If soreness, redness or swelling is apparent, consult your dentist for a diagnosis. Avoid the sunflower seeds or any irritants such as smoking and alcoholic beverages until you feel a normal condition has returned. You will need to monitor your use of the seeds and evaluate your future reaction. Thank you for your inquiry.