Based on the X-ray you've shared, it appears that a filling may be necessary. However, after conducting a thorough clinical examination and further diagnosis, if it's determined that the nerve is involved, a root canal treatment (RCT) might be indicated.
Given that this is a milk tooth that needs to be preserved, I recommend consulting a pediatric dentist (pedodontist) for a more detailed evaluation and to develop an appropriate treatment plan. They will be able to provide personalized guidance and care.
Next Steps
Visit a pedodontist for further evaluation.