No it is not a ceiling fan box. Will it hold one? Hard to say. But it was never meant to.

I replaced the heating element on my Samsung dryer twice. There are youtube videos of exactly how to do it and the part is like 15 dollars on Amazon. It's easy to test to make sure that's it also.

Yep my house has no grounds. It isn't ideal and one day I'll need to replace the wiring but it isn't urgent. Definitely worth checking to see if your electric boxes are grounded. Another thing you can do is add gfci's, so long as it is protected by a GFCI you can put in 3 prong outlets with no grounds.

A little confused from that description, but if either the wall, the fixture, or neither has an extra copper ground wire, that's ok. Wire nut off the extra one if either has it.

If there's no copper wire in the wall then your house probably has no grounds. If your wall outlets have two prongs with no third then you'd know this, but you'd have to test 3 prong outlets to be sure. Sometimes the junction boxes themselves are grounded by being connected to metal conduit.

Your teeth are surrounded by bone under the gums. It is this boney support that holds them in place.

They are attached to the bone with very short ligaments. Lots of little fibers connecting root to tooth. These fibers don't flex very much, but it's enough to give you a sensation of biting pressure, and so that your teeth naturally can move just a little.

It is possible for the ligaments connecting your tooth to bone to die and the tooth and bone connect directly together. Hard to remove a tooth like this.

Gum tissue attaches to your teeth as well, and can hold on pretty tight, but this sort of attachment alone isn't enough to keep your teeth from falling out during use.