If you have CC3 Pipeline, you have mesh editing tools that make it pretty easy.
Select the teeth.
Click the edit mesh in the Modify panel.
Select the "Element" tab.
Click one canine tooth, then hold down CNYTL and click on the other.
Select the scale gizmo.
Scale the selection on Z to elongate the teeth.
74% of original size (was 676x19) - Click to enlarge