How long does a cutting board last?? I know there are ways of refreshing your board...I have a small one that i can`t really use anymore because it has a permanent wave now and i can`t get rid of and I have a bigger board which i `ve used a lot. It needs refreshing...i can`t afford to buy a new one....i`m wondering how long does a board last?? What is the best way to refresh it? clean it? seems like some very small pieces of thread stay stuck in the board as i cut fabric....am i doing something wrong??Yes i change the blades on my cutting wheel often.