Baby Teeth

So Little B got his first two bottom teeth a few months ago. Yesterday morning his top two pushed through. It's so exciting, watching him grow! Babies are so amazing. The rate that they grow and learn is rediculously fast. We found out his top two teeth were in because we could hear him grinding his teeth. Now I understand he is just doing it because he is learning what these new obstructions in his mouth are for, but i hope he doesn't continue grinding them. I'm assuming that could be bad. Oh the worries of parenthood.