I had 4 separate surgeries - one for each extraction. The first was the absolute worst - age 16, complete nightmare. The last at age 28 was a breeze. Here's the, um, wisdom I acquired from that journey:
1) I smoked when I had the first and second done, did not for third and fourth. If he smokes don't let him smoke at all this next week. Can be hard getting a teenager to take that advice, but maybe a show him a few images of dry socket and tell him that's what is going to happen to him - not in 5 years but in 5 days - if he can't put down the smoke/vape for a month. Truth is even if a smoker avoids dry socket tobacco is just bad news for that open sore, preventing proper healing and exacerbating the pain.
2) If they don't prescribe percs demand they do. It's actually pretty painful and unless there's a history of abuse or known counterindications or sensitivities there's no good reason not to. Take for 48 hours as prescribed then stop and switch to ibuprofen or whatever otc doc recommends.
3) Avoid general anesthesia or IV sedation. It's overkill and can impact decision making for days, so maybe a bowl of captain crunch starts to seem like a good idea even though the plan was to eat oatmeal and pudding for a week. The local anesthesia, and if necessary nitrous-oxide if your son is prone to anxiety when at the dentist.
4) Take time off - off of school, off of work, off of chores, off of football practice. I tried moving apartments 4 or 5 days days after the 2nd surgery and I was leading Sunday School just two days after my 3rd one and both were really bad ideas. I was physically tired, I was in pain, I was grouchy, and I was HUNGRY (soft foods don't really do the job, especially for young people).
5) To that last point - for my final surgery made a glorious meat pie made with ground beef peas & carrots that required minimal chewing and kept me filled up so I could go back to work (had no choice at the time) eat pie in the morning yogurt throughout the day and more pie for dinner and I never felt hungry. Despite having to go back to work in less than 2 days, the last surgery's recovery period was by far the best, and the two biggest factors were not smoking and that glorious meat pie.