Both cells have same functions. The galvanic cell consist of two different metals connected by salt bridge. It is also known as electrochemical cell. It should not be confused with electrolytic cell. Voltaic cell also consist of two separate compartments.
But very oftenly, you get them from age 17-21. So yeah it depends if you already have your 12 yearold molars, I will edit if you say something! But here is ome more info on wisdom teeth! Wisdom Teeth get their name because they usually arrive about the time of adulthood (17-21 years of age).
Wisdom teeth are kinda unique from person to person. Some people they come in just fine over a matter of a few weeks sometime in their teens (or later). Some people just never get them. Others they come in sideways. And for some like you, they seem to take forever to come in, and maybe never will fully emerge. Give it a few more weeks. Teeth do grow in slowly and wisdom teeth are good big ones. If you really think that its taking too long go back and see your dentist in a couple of weeks. Good luck.