The teeth can be removed in a curve at a right angle to the line of the arch. In fig.8 and fig.9 are keys of that type with respectively two and three interchangeable claws illustrated. Sometimes the handle can be unscrewed from the shaft. Inside the handle is a screwdriver which makes changing of the claw possible, shown in fig.10. This type was later developed and manufactured by Charriere, shown in fig.11.
Different claws are changeable on the same shaft.
In the second half of the 19th century the concepts of Sir John Tomes, who developed the type of forceps which is sill used today, made the toothkey obsolete.