You should replace your kitchen sink every 10 years or so. You may need to replace it sooner if your sink is not professional grade or if you want to upgrade faucets and the new one will not fit correctly. You should also replace your sink if you notice any signs of rust or damage. To ensure that your kitchen sink remains in optimal condition, be sure to scrub it out and clean it regularly. If you take good care of your kitchen sink, it will last longer and you can get the most life out of it.