Light brown stains on front teeth (picture), what is it?

[modestas]

light brown stains appeared on my front teeth quite quickly (between 6-12 month period), and it would not go away... I wonder what could it be? I brush twice a day all the time, I don't smoke, nor do I drink coffee.. I rinse my mouth after each meal.

 

[MattKW]

Poor quality photo. Can't see enough definition. Sorry.

 

[honestdoc]

Are you rinsing with Chlorhexidine? It can stain your teeth.

 

[modestas]

Poor quality photo. Can't see enough definition. Sorry.

sorry about that. I attach 2 photos that are of a very good quality. pls take a look at them and let me know what do you think? I know it doesnt look good, but these teeth do not hurth and they are not sensitive or something like that. I wonder what could it be.

 

[modestas]

Are you rinsing with Chlorhexidine? It can stain your teeth.

I have used it for a few weeks in the past.. but I dont use it now. and yes, it says on description, that it can stain and discolour enamel. but it says it whould go away after you stop using it. but in my case these stains do not go away. so I guess it might be something else.