Yes, you can use aluminum foil facing to make sandwiches or wraps for lunch boxes. Aluminum foil is a common material used for food packaging due to its ability to keep food fresh and protected. It is non-toxic and does not react with most foods, making it safe for use in lunch boxes. However, it's important to ensure that the foil does not tear or come into direct contact with acidic foods, as this could potentially lead to the leaching of aluminum. Always handle food with clean hands or utensils to maintain hygiene.