hello, you need to visit a dentist and get it checked. get an x-ray done. if there is a cavity, you need to get it filled. if there is infection to the root of the tooth, you need to get it treated. then get a crown placed over it. For sensitive teeth you can use any good sensitive toothpaste available in the market.

Your description  of problem  is very vague hence you need to consult for solutions by visiting the dentist

Might or might not need RCT or filling. It depends on the what the problem is and can be determined only by showing a dentist.

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Hi,Please get a Xray done to evaluate the depth of cavity & a RCT may be required.Meanwhile take painkillers to reduce sensitivity.

Hello sir. You need to visit a dentist to get a proper clinical examination and x-rays done to know the exact problem.