An End Grain cutting board will usually last 50% longer than an Edge Grain cutting board.  When properly taken care of, an end grain cutting board will last ten years or longer. One of the main reasons why boards are replaced is because they become worn, warped, or discolored. You can circumvent most of this with regular maintenance. While wooden cutting boards resist bacteria better than plastic, laminated wood boards are not dishwasher safe and can be difficult to clean. Replace a wooden cutting board when it comes excessively worn. Replace a wooden cutting board when it gets excessively grooved or warped. Most wooden boards consist of several laminated pieces of wood, and they should be replaced if the seams between the boards begin to separate; bacteria may accumulate in the seams, and a cracked board may be dangerously unstable.