The first set of teeth we have as children are called milk or deciduous teeth. People also sometimes refer to them as 'baby teeth' because they are smaller than adults' teeth and start coming through when we are babies.
Between the ages of 6 and 13 years, all the milk (deciduous) teeth are lost and replaced with new, bigger adult teeth. As the new adult teeth grow up into the mouth, they push on the milk ones and make them wobbly until they eventually fall out.
By the time most people are teenagers, they should have 28 adult teeth although some of these may still be coming through. This is also the age when braces are provided if teeth need to be straightened. The only teeth left to come through after this are the wisdom teeth. Wisdom teeth usually erupt in late teens.
Click through the next few pages to find out more about milk and adult teeth.