The correction of gear toothing affects geometric and kinematic and strength characteristics as well. When designing corrections, first it is necessary to fulfill functional requirements and then optimize the corrections to improve some of the other parameters of the gearing.

Approaching and withdrawal of the production tool from the gear center changes the shapes and therefore also properties of the involute toothing. This creates corrected toothing. The illustration shows:
 

Correction of toothing enables:
• Achieve the exact axis distance.
• Prevent undercutting of teeth (roots of a small number of teeth might be undercut; this decreases the coefficient of duration of the meshing and reduces loading capacity of the teeth)
• Eliminate sharpness of teeth
• Prevent creation of production and operational interference of teeth
• Improve the contact ratio (achieve a contact ratio >1)
• Reduce noise and vibrations of the gearing
• Improve efficiency
• Increase loading capacity of the gearing (contact, bend, seizure, wear)