mostly due to long time neglected infected tooth is causing this , you may need a root canal treatment . visit your dentist to know the cause and further treatment.
Answered2020-02-17 10:58:14
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It can be a dental abscess with draining sinus. Do not neglect this condition. Treat the abscess and concerned tooth. Only medicines won't help you. Visit dentist for clinical examination and x ray.
I attached a photo...You can see my teeth is getting yellowing... Like rust brown..for Some teeth only ha
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