The root of a tooth extends under the gums and is anchored in your jawbone. When you have a tooth pulled, there is a hole in the jaw where the root of the tooth was. This is called the socket.
When the dentist pulls the tooth out, there may be chips of bone left over in the socket. The dentist has to break the tooth away from the jawbone in order to make the tooth loose so it can come out.
Sometimes when the dentist pulls the tooth out, the tooth can break and a little bit of the root can be left in the socket. The dentist will try to get this out by drilling down into the jawbone with the drill to loosen the broken tooth root. If the piece of root is too close to the sinus (upper tooth) or jaw nerve (lower tooth), the dentist may decide it is best to leave the piece of root in the jaw.
The actual term is "soft tissue impaction." This refers to how deep the tooth lies in the jaw. A soft tissue impaction means that the tooth lies just beneath the gum tissue and no bone will have to removed to extract the tooth. In contrast, a "partial boney impaction" means most of the tooth still lies within the jaw bone and some bone will be removed during the extraction. A "full boney impaction" means the entire tooth resides within the jaw bone and more bone will have to be removed to access and extract the tooth. A soft tissue impaction is usually the least involved and least expensive extraction of the three.
The bone is in a tunnel deep in the underground ruins. You will find it when moving left from the door with symbols on it. (see related question)
Deep bone
clampearl+deep sea tooth+trade
The outer layers of the tooth do not contain nerve endings. So, it isn't until the decay gets deep enough into the tooth to effect the nerves inside the tooth's pulp that you feel anything.
When you trade Clamperl with the deep sea scale you get Gorebyss with the deep sea tooth you get Huntail.
You can find the Deep Sea Scale and the Deep Sea Tooth on Routes 13 and 17.
You can't find this item to get it receive the scanner in the abandoned ship and give to capt stern he will let you have deep sea scale or deep sea tooth pick the tooth.
The Deep Sea Tooth and the Deep Sea Scale are both used to evolve Clamperl into either a) Huntail or b) Gorebyss. - Badminton
I believe what you are refering to is known as the nerve, also refered to as dental pulp or pulp chamber. This is found deep inside the tooth under the dentin which is under the enamel (located on top of the tooth). The cementum is the outer layer that protects the dentin on the lower half of the tooth.
Sometimes, if a filling is very deep and close to the nerve, a regular filling may not work. It sounds as though you will need a root canal. Find out more at: Thornhill Dentist http://www.bcdentalcare.ca
Compact bone