A pulpotomy is baby tooth nerve treatment. When a cavity is very deep and reaches the nerve of the tooth, it is necessary to remove a portion of the affected nerve tissue and place a medicament into the nerve chamber. The goal of this therapy is to maintain the vitality of the nerve and prevent infection of the tooth and extraction. Once pulpotomies is performed on a baby tooth, it is best to restore the tooth with a full coverage restoration like a crown.