how did the 1959 Tinker versus Des Moines has Supreme Court ruling affect students in public schools

In the case of 1959 Tinker versus Des Moines students started a protest against the Vietnam War using an armband, but the school threat to suspend them if they wore the armband, the parents of the children began a legal fight with the school, as a result the parents of the children took the case to Supreme Court which ruled a decision that guarantees and protects the right of free speech and self-expression of students in public school.

This decision allows now the right to free speech and self-expression, it affect the students in a lot of positive ways, one simple way it can be seeming per example is in the fact that this decision prevents schools from prohibiting nowadays students from doing things as wearing dyed colorful hair or piercing and protesting in the school.