What happens when a shark loses it's tooth?

If a shark loses its tooth then the next one pops out, sharks have very many layers of teeth, Or rows, If you type in, ''shark jaws,'' in safari or fire fox, you will see that they have lots of rows, witch makes it easy for them to break skin, and to start ripping at there preys flesh, cause flesh wounds witch can rip into your muscle tissue, in witch you could loose a lot of blood and die from this.