What all foods he can have after tooth extraction?

Hi, my son is suffering from a toothache for several months. We have consulted a children's dentist in Ajax. But, the pain is occurring repeatedly. His medication will only give a temporary satisfaction. He is really struggling with the pain. I shared this problem with one of my friends. She suggested me a dentist in Ajax, Dr. Mitchel Shields for getting the treatment. She had undergone cosmetic dentistry treatment from there. We are planning to take an appointment with the dentist. Also, he will be having an exam on next week. So we are going to take consultation before that. But before undergoing the treatment, I would like to know whether he needs to undergo any tooth extraction. If so, how many days of rest is needed? What all foods he can have after tooth extraction? If anybody knows about this, please help me with your valuable replies.