Clinical research suggests 25-30% bone loss vertically and 30% on outside bone after a tooth removal within 6 months.
On grafted sites, 80% likely had less than 20% outside bone loss.
On the other hand, ungrafted sites had 71% likely having more than 20% outside bone loss.
All in all, bone graft after a tooth removal or "socket preservation" will help the extracted site retain the bone a lot better and it works tremendous for future implant procedure.
This after photo is at 1 and half month mark.
Before
After