When you see or feel teeth below, it's too long. Since it is wiggling, it's already ready to come out. Sometimes the tooth is ready but it won't fall out on it's own easily anyway. I had to take my son to the dentist once because he was so afraid of pulling it off that it re-anchored but a new tooth was coming out. My kids usually took max a week but eventually they get used to it and pull it out in a day or two.
Source: Unknown. Iron ore was first discovered by European settlers when the early land surveyor, William Austin Burt, was shown iron ore by an Indian chieftain near what is now Negaunee, Michigan, in 1844. He had noticed a strange movement of his compass needle while surveying near where the present town of Ishpeming is located.
For example, it is an iron atom in haemoglobin that is responsible for carrying oxygen around the blood stream. Iron is not found as the free metal in nature. The most common ore is haematite (iron oxide, Fe203). Iron is found in other minerals such as magnetite, which is seen as black sands along beaches. The core of the earth, more than 2000 in radius, is composed largely of iron.