My top ones seem to have enough room. I didn't even notice that they had already come in until I was in pain with my bottom one and poking around in my mouth. But the bottom one that's coming in—the other one is hiding out and waiting, I just know it—is killing me. Or, was killing me. I'm 99% sure that there's just not enough room for it back there. I'm glad it's not impacted, though. That would suck so much more.