Wood garage doors are more resistant to most damage compared to metal garage doors except for termites or water damage do to rain, snow if the garage door is not well painted and cared for. To care for your metal garage doors, inspect regularly for dents, cracks and scratches. Also, check for any rust that can permanently ruin the door. Wooden doors must be varnished or painted every so often to ensure that it is not exposed to water for prolonged periods. You could also get your doors inspected by a professional who can identify some damage that an untrained eye could miss.