What is the spiral direction most commonly associated with a narwhal's tusk?

A narwhal’s tusk is most commonly described as having a counterclockwise spiral when viewed from its tip.

The tusk is an elongated upper-left canine tooth that grows through the upper lip. Its helical grooves are formed as the tooth develops, producing the characteristic twisted appearance. Most male narwhals grow a tusk, while females usually do not, although females can occasionally have one.

The tusk is not a hollow horn and does not grow from the forehead. It is a living tooth with sensory nerves and a porous structure. Narwhals may use tusks in social interactions, and the famous behavior called tusking involves individuals rubbing or crossing their tusks.