How many days does a tooth take to heal? Two lower ones came out easil…

How many days does a tooth take to heal? Two lower ones came out easily, now the upper ones are coming in. There's been some time already with a white edge shining through, saliva and so on - according to the standard. Woke up today with tears, though my son rarely cries, tears just come down like a waterfall. Can't even look at his mouth. He falls asleep with his breast, you can see when he eats that it hurts him. Asleep-wakes up again crying ?? How long does this phase last on average?