Groomers Tip! First and fore most, if a pair of your grooming scissors are catching or have completely locked, DO NOT continue to use the scissors and DO NOT repeat the opening and closing of the scissors. This action can cause further damage to the cutting edges of the blades and if any dents have been made, this repeated action of opening and closing will deepen the dent or dents and potentially cause further issues. 

Please put the scissors down immediately and follow the steps in the link below. 

The 'clearing method' is a great hack which can help a dog groomer fix a pair of scissors after catching or locking has occurred. This method can help the blades 'clear' the dent/s and allowing the groomer to continue using their scissors. This is however, only a temporary fix and it is advised that a scissor sharpener take a look at the scissors to  ensure that they are functioning correctly. 

Please note that this method may cause a blunting affect on the area where the catching or locking has taken place. Because the action of the fingers and thumb pressing against the blades, this will create extreme force between both cutting edges. This in turn forces the blades tightly against one another and grind passed  rather than gliding smoothly passed one another. 

Please make sure that it is only the damaged area which is being worked on and not the rest of the blade.  Again, it is highly recommend that you seek advise from a scissor sharpener for the next steps.