It is logical that protectors do not last forever, but if you install properly, it keeps for several months.
They can not be seen and dissolves usually not by itself from.
For the first time ever, it is quite possible that you can not make it and is forced to throw away the protective film the same, but learn from our mistakes and then it should be no problem.
Tip:
Do they work as possible so as Staubfussel comes quickly between iPhone screen and protector.
It is normal that a relatively large air bubbles after sticking under the film, but it is possible to remove them completely with a little patience.
Price-performance ratio is very good, definite buy recommendation.