Hi there ....its because of the infection that your tooth is paining and becoming discoloured...visit a nearest dentist ASAP for proper diagnosis with x-ray and plan out the treatment accordingly...
Take care ...!!
Hello good evening
As per your description it appears that either your tooth is decayed or the teeth has stains. Either of these conditions are disturbing you at the moment. Visit a dentist nearby to rule out what has gone wrong. Depending on the condition you might be advised fillings or root canal treatment or Scaling.
All the best and
It seems from your description that your tooth is decayed and there is some associated infection. You will need an xray and a personal consultation with a dentist.
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