YES they most definitely can change lives for the better!
Name changed. Like some of the posters on here have already written about, I was born into alcoholism, violence; instability and poverty and had not one bit of positive parental support.
School was my sanctuary, a stable place, a place to succeed.
I worked hard escaping into school work (with parents who never once in 12 years visited the school) and participated in every single thing on offer at school so I didn't have to go home. Doing well at school was the only positive thing in my life, even if no-one else cared.
In my childhood country there was no such thing as government student loans however because I had done well enough at school, I was awarded a bursary to go to university, the first in my family - and went on to an independent life I could never have achieved without the early presence of inspirational teachers.
Looking back my teachers must have known about my crappy home life, everyone did - but they made me feel "normal" because they never asked about it, there was no extra attention - they always just focused on gently pushing me to challenge myself.
They gave me academic encouragement and; simply by being a consistent stable adults, they were at the time my most meaningful and aspirational role models. They were clever, dressed smartly, professional and had a passion for their subjects. Everything my family was not and everything I aspired to be.
It was just "schoolwork" or "extra curricular" but the simple fact that the teachers made a positive comment every now and then, believed in me and encouraged me was everything. All I had.
I feel teary writing this now. It is honestly true.