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Root canal treatment and Apicectomy if the infection persist after root canal treatment.

It sounds like you may be experiencing a significant cavity, especially given the discomfort and the visible damage to the tooth. Cavities often develop due to tooth decay, which can be caused by bacteria, poor oral hygiene, or excessive sugar intake. Symptoms can include pain, sensitivity, and visible holes. To address this issue, it is crucial to see a dentist who can evaluate the extent of the decay and recommend appropriate treatment, such as filling or possibly more extensive procedures. 

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.

The cost of a root canal treatment varies depending on the tooth and the severity of the condition. It can range from Rs. 3000 to Rs. 12000. However, it is recommended to visit your dentist for such a procedure