I have removed several by laying a wet rag over the dent or ding and then using an iron to apply heat. very carefully and at short little intervals checking the progress as you go. Keep the area damp with the cloth and it will not scorch.
Good luck,
Packdog
If the dent's too big or you have a gouge, there's always inlays. For filler I have heard of shellac sticks which come in different colors and you melt and fill the hole with them.