I am having throat pain for the last 15 days, I fill pain when speaking and eating, What to do?

Ans: Hello
Only a few of us are lucky enough to be born with pearly white teeth. The rest of us have to make do with teeth which have a naturally creamish, greyish or brownish tinge of varying degree. I am, of course, not referring to those who choose to have poor oral hygiene or are addicted to smoking or chewing tobacco.
I'm afraid brushing well - or even brushing obsessively - is not going to make your teeth any whiter. On the contrary, brushing excessively or brushing hard can make your teeth look even more discoloured by unintentionally wearing away the enamel (the hard, outermost and whitest of the tooth's layers)
Over-the-counter whitening products are essentially mild versions of chemical bleaching agents (intentionally kept mild because such products are used unsupervised) which have limited effect or may take a long time to show results.
Your dentist, on the other hand, can bleach your teeth using suitable agents of stronger concentration which will show quicker and more visible effect.
In some cases, where the discoloration cannot be corrected by bleaching, you may need to have veneers made for your front teeth which will 'hide' the discoloration.
Please consult your dentist to know your best option.