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.
Introduction. Tooth decay is a common problem that occurs when acids in your mouth dissolve the outer layers of your teeth. It is also known as dental decay or dental caries. Although levels of tooth decay have decreased over the last few decades, it is still one of the most widespread health problems in the UK.