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What does PCHS stand for in the city of Karachi, Pakistan?

If I have taken medication, how long should I wait before lying down? I ask this in order to avoid damaging my esophageal sphincter. I guess that the same question also applies to after eating food.

I have a discolored tooth that my dentist says has been caused by nerve damage. Is it possible to reverse the discoloration? Also, I rinse my mouth with baking soda. Could that have caused the...