Karl my friend my business partner and I often joke about the guy who comes into the shop and is acting like the world is going to end. He tells us he is so upset and he sure hopes we can help.
This is NOT directed at you my friend just sharing what a dent means to us these days.
He opens the case and says "look" and stands back as if he is looking a pile of dead bodies.... Dave or I will look and we can't see anything untoward so we invariably say "what?" He says again "OMG, it's awful look?" That's when I might say "WTF I don't see anything..."
Then he points out a very small scratch or a ding of some sort and he looks as dejected as can be.
Dave and I look at each other and we both have a look on our face like we had better not say what we are thinking..... So we usually don't. But if we know the client well we might say what we were thinking which is "great, now that you f-ed up your guitar you can relax and learn how to play the thing...."
Sorry could not resist.
We would not recommend fixing this because the scope of these things, the project will creep. You start out with a dime sized blemish and then it becomes a quarter and so on and so forth.
If you do want to fix it I am not sure if the white will go way with the following, probably not but the dent will go away. Try steaming it with a soldering gun and wet rag (have fire extinguisher charged and ready to go...). I did a tutorial on the OLF that may be called "Steaming out a dent" that shows how to do this.
So I would try to reduce the dent (or eliminate it) with some steam first and then if need be drop fill with a quality thin CA, never use accelerator unless you are using Glue Boost. We wait over night and then scrap back the CA. A couple applications may be necessary. Once it's leveled from scraping and filling we wet sand. It likely from my experience will show a little but will be better than it is now and most important since a guitar is a tool for a musician you won't be able to feel it and get distracted when playing.
I don't know if anyone ever said this before but guitar building is an exercise in making some mistakes along the way and then getting old enough to forget that you did
I've forgotten a lot....