During our lives we all grow two sets of teeth. You got your first teeth when you were a baby. These teeth are called your milk teeth. You grow 20 milk teeth altogether. You begin to lose your milk teeth from around the age of six. New teeth grow to replace your milk teeth. These teeth are very important, as if you lose any of these teeth they will not grow again. These teeth are called your permanent teeth. You need to look after your teeth carefully, otherwise they will decay or even fall out. Remember to wash your teeth every morning and evening.We can grow up to 32 permanent teeth altogether, 16 on top and 16 on the bottom.