If you have a palatal torus, then a hard bony bump exists on the roof of your mouth. The item is sometimes extremely painful, especially during the chewing of food. But it is generally harmless. Sometimes, it may be caused by teeth grinding or a stress disorder. To ease the pain try to go on a diet based on a receive of soft foods and do not eat hard or crunchy pieces. If the pain persists, make an appointment with your dentist for further evaluation.