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Anonymous
>>72776
It's just hardened dental plaque, OP. In the olden days, they used to call it "tartar". While the normal "accepted" average colour tends to be yellow, brown is a common colour.
Just brush your teeth thoroughly in those areas, and go to a dentist to get some scaling done to remove it.
>>72799
I'd recommend against hte mouthwash and chewing gum. Even the "sugarfree" ones are dusted with powdered sugar, and both have been proven to be ineffective against the very things it advertises its effectiveness.
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