Brownish tinch between lower teeth

[rkchinch]

My lower teeth have developed brownish tinch between teeth at the bottom. I hv been doing flossing and also sparingly using mouthwash. Could this be because of rough flossing.? Or is the reason the accumulation of plaques? Can this go away with cleaning with water jet? Of course I have plans to visit a dentist after receving some preliminary suggestion here

 

[MattKW]

Either calculus (tartar) build-up, or food staining, e.g. tea, coffee, red wine... A water jet won't move it. See a dentist.