How to find a crack on the tooth.

It sounds like you're experiencing persistent gum pain in your second lower right tooth despite the dental treatments you have received. Here are a few possibilities and suggestions: Infection: Although your dentist has taken X-rays and stated that it looks fine, it's still possible for an infection to be present. In some cases, infections can be difficult to detect on X-rays, especially if they are limited to the gum tissue. If the pain persists or worsens, it may be worth getting a second opinion or consulting with a specialist such as an endodontist or periodontist. Cracked tooth: A cracked tooth can cause persistent pain, but it may not always be visible on X-rays. If your symptoms continue despite dental treatments, it's possible that there may be a crack in the tooth that needs further evaluation. Again, consulting with a specialist may be helpful in diagnosing and addressing this issue. Nerve sensitivity: The cold test performed by your dentist indicates that the tooth has sensitivity, which could be due to various factors such as exposed dentin or gum inflammation. It's possible that the sensitivity is contributing to the ongoing pain. Considering your prolonged discomfort and the lack of improvement, it may be beneficial to seek a second opinion from another dentist or specialist. They can conduct a thorough evaluation, review your dental history and X-rays, and provide a fresh perspective on your situation. They may suggest additional diagnostic tests or treatments to help determine the underlying cause of the pain. In the meantime, you can try some self-care measures for pain relief, such as rinsing your mouth with warm saltwater, using over-the-counter pain medications as directed, and maintaining good oral hygiene by brushing gently and flossing. However, it's important to consult with a dental professional to get an accurate diagnosis and appropriate treatment.

Pain in gums due to heavy build of calculus better go for deep scaling and curettage for that tooth it will help to reduce infection in that tooth area

maintain good oral hygiene and proper brushing technique so that these type of infection won't occur again