The phrase is a popular label, not science. Dopamine is a normal part of how your brain works and you cannot remove it. What people usually mean is cutting back on the quick, endless rewards of feeds and short videos, so slower activities feel easier to start.
Clear, shared rules make it work. "Use my phone less" is vague; "no short-form video, no feeds before noon" is something you can tick honestly at the end of the day.
Fourteen days is short enough for the whole group to commit, and long enough to notice what you reach for when you are bored. Many people come out of it with one or two rules they decide to keep.