White bone-like thing sticking out of gum

[Lilian8286]

So I had just undergone a tooth extraction 6 days ago. The pain is still there and it's increasing day by day. A white bone-like thing sticking out of my outside gum. I can feel like a buldge of something on my cheek. I feel like it's always poking at my cheek but it doesn't look sharp. More like slightly long. At first, I thought it was an ulcer but then slowly it's beginning to get more exposed. What is that thing? Is it my leftover tooth or my bone gum sticking out? But my dentist clearly told me that he had extracted the whole tooth out... I'm really scared every second it will get more exposed. I'm scared that my gum will tear.