Tutorial Rooting tablet

Hello Members
i wana ask few things about rooting the device.
1. is rooting the device is safe as i listen that it can damage device?
2. how to unroot?
as specs of my device are as follows
Model: SATC Tab T1
OS Version: 4.0.3
Processor: ARMv7 rev2 (v7l)
BogoMIPS: 1007.45
Hardware: RK29board

Looking for help
thanx in advance