When you were six years old, you had 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to【11】. The

When you are six years old, you have 20 teeth. These are called milk-teeth. After you are six, your milk-teeth begin to fall out. They’re making way for a new set. As new teeth come in, they cut off the full supply to the milk-teeth. After a while, the milk-teeth fall out By the time you are 25, you should have a whole new set of teeth. And you’ll have 12 extra teeth．In all, you’ll have 16 teeth in each jaw．