In my kitchen I have limestone tiling and wooden worktops.Where the tops meet the tiles there is a thin line of grout which,in some places,is breaking away. I am wanting to refill the gap and wondered if I might be better using silicone sealant.Someone told me it's better if you have movement in the tops as it will flex and not break. Does anyone have any advice.I have both in the cupboard so just trying to decide. Thanks a lot if you can help.