How do i protect the touch screen?

Hey guys, do any of you know what effect putting a screen protector on the touch screen does for your game? Like does it make touching the screen less accurate or whatever? Also, what would you guys suggest is the best way to protect the bottom screen from being scratched?

thanks in advance:D

Ive never used a screen protector and my DS is fine ( still looks like the day I bought it), and I've played at least over 40 hours of Ouendan.

Just as long as you don't try to stab the touchscreen, its pretty hard to scratch it

Two words: Hori screen protector.

Wait...*counts his fingers* there are three words!!!!!