Health Benefits Center

What’s with my teeth?Help please!?

I was looking at my teeth before and noticed the the gum of my second incisor (lateral I believe ) had dropped and exposed a kind of small white semi-circle at the base of the tooth just above the gum.
My sister reckons this is plaque but I can't scrape it off easily.

Also the gap between my central incisor and this one feels much larger than usual,though I know things tend to feel exaggerated in your mouth.

The other little thing is that when I bite a little I can feel the gum behind my right back molar a bit.

I'm 34 and brush 3 or 4 times a day though should floss more often either way wouldn't brushing at an angle get rid of plaque on the front of the tooth just below the gum?

My mouth feels weird!

Any ideas please I only noticed it today.What would my dentist do?

Thanks.