At some point you will need to change the strings on your guitar. I recommend changing them at least every 6 months. But, if you play more than a couple hours a day, you should change them more frequently. I change my strings at least once a month, sometimes more. You can tell if they need changing, because they will start to sound dull and the coils on the strings will start fraying. If the strings wear too much, eventually they will break. And find a good brand of strings and thickness that works for you. I use light gauge strings on my electric and medium gauge strings on my acoustic.