Engines are designed for a "normal" sortie - take-off power for up to 5 minutes, climb power for up to 20 mins, max continuous for however long.
If you use take-off power on take-off and again on landing, all that is happening is that you are using up the engine life faster than expected - you will see metal in the oil and some chip detectors well before the normal overhaul time. It is expensive, but if you NEED to use the power, then use it. Don't go splat in the trees to avoid going over a limit. But tell your engineers.