The stone­-like thing in the pictures you se­nt looks like a small tooth deposit. The black line­ could be stained or cracked. Tooth deposits can form from leftove­r plaque. Stains might come from food or drink. It is good you have no pain, re­d, or swell - that is a nice sign. To fix this, make sure­ to brush and floss a lot. Also, see your dentist for a check and cle­an. They can take care of the­se things for you.

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Yes, a toothache, cavities that are very deep or an infected tooth might necessitate root canal treatment. The cost of a root canal treatment in India can vary depending on various factors such as the location of the dental clinic, the experience of the dentist, the complexity of the case, and the type of dental equipment and materials used. On average, the cost of a root canal treatment in India can range from around ₹2000 to ₹10000 or more per tooth. For more information, you can visit the following page: https://www.clinicspots.com/cost/rct-root-canal-treatment/india
 

If there is a small lump or sore beneath the tongue, it might be a canker sore or clogged salivary gland. You can get these if you accidentally bite your tongue or eat something hard. To lessen the pain, try rinsing with warm salty water and avoid hot, spicy, or acidic food. If it persists beyond one week or worsens anytime before then, it’d be wise to seek advice from a dentist.

It sounds like you might have a problem with your temporomandibular joint (TMJ) or a dental issue. It's best to see a dentist or an oral surgeon for a proper diagnosis and treatment. Avoid hard foods and take over-the-counter pain relievers like ibuprofen. Please visit a dentist soon for accurate care.