Hi. I'm Dr. Lee and will do my best to help.
Can you tell me when was the last time he has had blood test done and what were the results?
Also, when was the last time he had gone under anesthesia for teeth cleaning or teeth extraction?
It appears that you are offline. If you can please provide the above information so I can better understand the situation and help. Once you reply, I will do my best to return to this chat as soon as I can. Thanks!