Hello. The question is off-topic. I recently had a tooth drilled and …

Hello. The question is off-topic. I recently had a tooth drilled and a few days later my nerve on that same spot became inflamed. Question: Is it the fault of the doctor or just coincidence? On day four after treatment, I went swimming in the sea, and the water was cool and immediately an impulse went into this tooth. And then the pain increased. I went to my dentist, said that the tooth needs to be opened and cleaned out. But the doctor went on vacation, and sent me to her colleague. Today she charged a decent sum for cleaning the canal. Is this the fault of the dentist, when during treatment she poorly cleaned it, so that the nerve became inflamed or just coincidence?