This study is for children and young adults who have a severe toothache in a permanent back molar, caused by an inflamed nerve (a condition called irreversible pulpitis). Usually, the treatment for this is a root canal, which removes the entire nerve. However, a different treatment called vital pulp therapy or pulpotomy may be an option. This simpler procedure removes only the infected part of the nerve, leaving the healthy part alive, and then seals the tooth with a special material. The goal of our research is to see if we can make this pulpotomy procedure even more comfortable for patients afterward. We are testing two approaches: Using a modern dental filling material called EndoCem to seal the tooth. Using the same EndoCem material, but first applying a gentle laser to the healthy nerve tissue. This laser treatment, known as biomodulation, is thought to help calm the tissue and improve healing. Patients who join the study will be randomly assigned to one of these two treatment groups. The main thing we will measure is the level of pain after the procedure, which patients will record on a simple pain scale. We want to find out if using the laser in addition to the filling material leads to less pain and a better experience after the treatment. This study will help dentists understand if combining this new sealing material with laser therapy can be a more effective and comfortable way to save a tooth with a severe toothache.