Yes you can reheat rice and it's safe to do so.
When you have some leftover rice just make sure to refrigerate the leftover rice and then reheat the rice within 1 day because the longer the rice sits in the refrigerator the more chance the rice has at growing mold and going bad.
When reheating the rice just add some more water to the rice and either reheat the rice in the microwave or in a pan on the stove.
If you reheat the rice in a pan on the stove make sure to stir the rice as it's heating up and do not leave the rice heating up for too long.
It usually only takes 1 to 2 minutes of reheating the rice either on the stove or in the microwave.
I've heard that it's dangerous to reheat rice but never could really see why.
There's nothing bad that is gonna happen when reheating rice and it's not gonna harm your health as I've been reheating rice for a long time.