A primary tooth pulpotomy is sometimes called a baby tooth root canal. It is performed on baby teeth with extensive decay that has affected the nerve of the tooth. The affected part of the nerve and the blood supply of the tooth (also called the pulp) are removed and the remaining part of the pulp is treated with a medication. Following a pulpotomy, the tooth usually needs a stainless steel crown. The purpose of a pulpotomy is to save a decayed baby tooth, so that the tooth can hold the space for the permanent tooth to come in. An alternative to the pulpotomy is an extraction (tooth removal), followed by a space-maintainer.