Is while(condition) { yield return null;} safe?

Unity Engine
1

Hello. I wonder which is better safely on commercial projects “yield return condition;” with
“while(condition) { yield return null;}”. Thanks.

2 
//This loop will go infinitely.
while(true){
    //Stuff here
}
//This loop can only go 10 times
int x = 0;
while(x < 10){
    x += 1;
}

while loops are safe as long as there is a very rare or never chance they will run infinitely

3

while loops are perfectly safe withing co-routines as long as you yield. Even while(true) loops.

4

Thank you for all replies.