A pulpotomy is when the inflamed pulp chamber, usually on a baby molar, is removed, the area is sterilized, and the chamber is sealed. It is sometimes called a baby tooth root canal, but it's not really a root canal and it can be done is some cases in permanent teeth.
Princess Royal is a style customarily (but not automatically) awarded by a British monarch to his or her eldest daughter. Holders retain the style for life, so a princess cannot receive the style during the lifetime of another Princess Royal. Queen Elizabeth II never held the title as her aunt, Princess Mary, was in possession of the title. There have been seven Princesses Royal. Princess Anne is the current Princess Royal.
The royal baby will be fifth in line to Britain's throne, after Prince Charles, Prince William, Prince George and Princess Charlotte, regardless of whether it is a girl or a boy. This will push Prince Harry into sixth place in the order of succession, and every other member of the royal family will be one step further away from the throne.