[Dion]

The bumps to which you refer are known as "mandibular tori", and are considered a variant of normal oral anatomy. You can read more about them here:

http://en.wikipedia.org/wiki/Torus_mandibularis

The extrusion of a sharp piece of material from one of your tori is more difficult to identify, and you will need to have your dentist assess the situation in person.

Although these bony prominences are vulnerable to scratching and other injury, there is the possibility of a more significant problem in the underlying bone-- perhaps an infection, which should be properly examined.

http://en.allexperts.com/q/Dentistry...pushes-gum.htm