It depends on which method you use. Check out the methods section in FAQ Part 2 to find more information about the method you want to use.

A dread perm is when a salon puts all these chemicals on your hair, (fries your hair) and then they just twist the hair, put wax and rubber bands on it and eventually the hair will dread.

I don't recommend them, because it ruins your hair, makes it brittle, and break, but if you want one you should talk to the hair police they do them and they have tours.

Extensions are hair that is braided or dreaded into your hair to make your dreads fatter, or longer. Most salons can put them in your hair, but you should check around and see how they put them in. It is better if they dread it into the hair, because if they braid it in the braided part never dreads and it looks really funny, but if they dread it in it looks like your real dreads.