Well my bf went to the dentist (3rd one) and he took x-rays and he said he couldn't find anything wrong with his teeth

He said it could probably be his wisdom teeth, but the doctor said he was young for it to be his wisdom teeth (mybfs 23). The doctor gave him some vicadin for the pain and has to go back in ten days to see if theres any changes and possibly sending him to a specialist. I just don't understand how the 2nd dentist said he needed a root canal. He would of paid $500 for something he didn't need.