Anybody has ever had that happened to them?

I saw last night that I could see some of the roots (start of it not all) of my teeth and this afternoon I checked it out on the internet and this is apparently what that is. I could feel something was weird when brushing my teeth on top at the right about a week ago but sometimes I have issues with my gums which are never serious and go away like it started so I did not looked, yesterday morning this started at the bottom left so I checked it last night. There's no pain and I also do not have the sensation that the teeth are moving. What I can see is this is what I have then if caught early it's not serious but it can lead to an operation if not taken care of. I called the dentist (moms - the 1 i picked when moving here has either moved or is retired) and they weirdly are closed so I will have to wait tomorrow to get an appointment (the message said they were opened tomorrow).

I whine when I get cleanings done on my teeth so you can all imagine when I have fillings done so hopefully this is either not serious so will go by itself or this won't need an operation!