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Nathe said..
Wow are you kidding me, smashing the knot between a hammer and concrete? If we caught someone at work doing that to dyneema slings they would be condemned...I'd stick with the knot in my lines, your probably doing more damage trying to get it out. You usually give good advice but I reckon this isn't one of them
Totally agree with Nathe, this is very bad advice Christian. You can see how much you damaged the line after you remove the knot, see how furry it was? That furriness is broken line fibres and the line is now permanently damaged and weakened
The pliers with a flat section is a good tip, but the lines should be soaked first with a soapy water solution, you want those fibres to be well lubed so they slide on each other and do not break. Water/lube and squashing the knot flat and rotating it 5-15 times will loosen any knot to the point where it can be undone by hand with no damage.
A hammer can be used, but the line must be wet/lubed and supported on something hard and shiny, like a glazed floor tile, or something made of polished metal, etc.
Tap the line with moderate force, just enough to flatten the knot and then rotate same as the pliers method, and within a few taps and roations, the knot will be loose enough to undo by hand.
Sometimes a large sewing needle and a thimble are needed to work the line to help loosen that very first bit of the knot, after that you should be able to undo with your hands, if not, then you need to "work" the knot a bit more with the hammer or pliers.
Teeth - def not recommended unless you have no access to the above tools and soapy water. The surface of most teeth are actually quite rough and can have very sharp edges capable of damaging those line fibres. Also your teeth will not make an impression on a knot thats been pulled really tight under load. Plus you can chip or break your teeth.
I've been using the hammer and a shiny surface with wetted line for decades now and have never had a knot I could not undo, or had a line that was damaged as a result of getting the knot out.
This idea of "working" knots with a hammer is old, goes way back to loosening knots in ship mooring lines, but in that case it took a few men to handle the rope and another to swing a sledge hammer onto the knot! And they did wet the line if it was dry.