The string on a bow is just about the most essential thing to check amongst all your archery equipment, if you do nothing else maintenance wise and just throw your stuff in a cupboard or shed after shooting you really should wax your string regularly to reduce friction as well as to protect the string from damage due to dirt, moisture and other agents. How often should you wax a string? You will do it no harm by checking and waxing it at least once a month - I check mine every time I string the bow to shoot. Many a good bow has been damaged by a string breaking which didn't need to.