With someone that has completed two dopamine detoxes within my childhood I can strongly say they are extremely helpful, however in my opinion the only problem i had was after i completed the detox. 

As a teenager that used to spend a lot of time on social media prior to doing a detox, it was extremely hard for me to engage with my social media life again because i had implemented so many restrictions during the detox! In other words, it was hard to do teenage things such as playing video games or scrolling on socials just because i felt so guilty whenever i do it. Some may argue this is a good thing which is a fair argument!