The cause of an Ingrown toenails is when a poorly shaped nail and poor toenail cutting methods like cutting into the corners are combined because this will leave a sharp piece of nail as it grows forward and penetrates the skin. To remove this problem you have to visit a podiatrist and they will skillfully and painlessly remove the small fragment of nail that is causing the problem. But this is still not enough because the nail still has the poor curved shape to it that has caused the problem in the first place and so, the best long term solution is for you to undertake an ingrown toenail surgery that can totally remove the whole edge of the nail that grows into the skin.