Thanks for sharing pics! There is gum recession caused due to plaque and calculus(tartar)deposition ,which is appearing as spacing between teeth , There are lot of stains as well. Please visit a dentist for professional cleaning. they will also guide you in right direction with oral hygiene tips .

Hello The main reason for this is due to the deposit, please get the scaling done by the dentist

Hello First image shows space that's because of bone loss(if you see your gums are moving downwards) This can occur due to various reasons including poor oral hygiene, traumatic bite (the way upper and lower teeth contact) In your case, traumatic bite is the major cause of this spacing. Second image shows deposits, you need professional cleaning so as to prevent further damage.

Hello This has occurred because of the yellow layer( calculus) getting formed on teeth. When that debris starts sitting in gums,gums get irritated and receed downward which is why that gap is seen Kindly get a cleaning done from your nearest dentist

It’s called gingival black triangle which are unaesthetic in appearance It is due to several reasons main cause is recession of gingival As a periodontist I can give you a right treatment plan

The space is due to gum recession and bone loss..

Hello Sir, The gasps you are observing is due to gum disease. The area seems to have bone loss adue to which the gums are slowly shifting.

Whats your age?its a case of recession,your gums are moving away from their original placement,any habits?

This looks like the gums have receded a bit below their normal position so you need to work on your gum health .