Thanks to my new knife, i have pulled out our old wood cutting board from underneath the recipe books and begun oiling it. As we have had it for some 10-12 years, it has been neglected in the oiling. The board is 15x15x2.5, edge grain, but I have no idea of the wood (guessing maple as one of the sides looks like some of the flame maple guitars I have seen). About 4-5 of the wood joints on the edge have some gapping. Will oiling cause the wood to expand back? If it doesn't expand back, is there some kind of filler I can use? I will try and post pictures when I get home for lunch.