When a person spikes the volleyball hard from the other team (or side), a person from the team opposite of the one who just spiked will block the ball and keep it off their si â¦ de.
Tooth decay is the destruction of your tooth enamel, the hard, outer layer of your teeth. It can be a problem for children, teens and adults. Plaque, a sticky film of bacteria, constantly forms on your teeth.
1 Tooth decay: A general name for disease of the teeth, including cavities and caries. 2  Periodontitis: Inflammation of the deeper structures of the teeth (periodontal ligament, jawbone, and cementum).