Why does my left earbud not working anymore?

My left earbud seems to be not charging, not functional, no lights that indicate anything, the lights doesn't even turn anymore; i tried cleaning both the case ( the 2 metal thingies included in it ) and the earbud itself but still it's not functional, I fear that prying it open might lead to worst case scenarios since i don't know what I'm dealing with (with full intent on self-learning about the earbud's "anatomy"). If anyone out there knows how to fix it, i would greatly appreciate it if someone out there would give instructions on how. Advance thank you.