No thing how careful you are you lot're probably going to hit or knock your canvases at some point and go a dent in them. As much yous push the dent dorsum out from the underside information technology won't piece of work, that'south considering the fine sail threads have been stretched in that expanse. Fifty-fifty if you fit the sheet tightening wedges that come with nigh canvases into the corners, it still won't piece of work. And then let me prove you what does piece of work:

get dent out of painting
Hither is my dented canvas.
Dent in a canvas painting.
You can see in this close-up the dent it quite deep.
Dent in back of canvas painting.
If I were to try and push the dent out from this side it would simply not work.
Wet rag in sink.
So what you lot need is a clean rag or sponge and brand it wet, ..very wet. Y'all can't damage your canvas by making it also moisture (avoid getting too much water on the wooden stretchers).
Rubbing wet rag on canvas painting.
Turn your canvas over and place it on a clean flat surface, and so with your wet rag/sponge wet the back of the sail all around the dented area.
Rub wet rag on painting.
Rub your rag or sponge up, down, back and fore until the weave of the canvas information technology good and wet.
Put water on canvas painting.
Once the canvass is sodden, apply some pressure to the dented area and push it down flat.
Leave wet rag on painting.
It will practice no harm to go out the soaked rag/sponge on the effected area for a minute of and then.
Photo of dent in canvas painting.
After a couple of minutes rubbing the back of the canvass this is what the dented surface area looked like on my canvas. The brush handle is pointing at the paring.
Damaged canvas.
All that remains of the harm to my canvas is a small impression left where the paring was at it'due south sharpest.
Fixed canvas painting.
This is the canvas after going through the process higher up, fixed.
Artists Cat.
This cute girl (Pusspuss) is the reason my sail had a dent in information technology in the starting time place, she denies responsibleness.

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Happy painting.

Chris