I have been using a hairbrush made out of boar bristles which is supposedly good for the hair. At first I had no idea what boar even was, I didn’t even assume it was an animal. I did my research and to my dismay and surprise, boar ended up being a type of khanzeer. Was it najes everytime I used that brush? And did I break my wudhu when using it? We’re all my prayers invalid? And Since I really had no idea, will it be held against me all those times I used it?

1- If your hair was wet or the boar hair brush was wet then your hair became najes. Otherwise it was pure.

2- No that would not invalidate your wudhu.

3- Your previous prayers are valid since you did not know.