Cool Riddle

Collectively I’m a commodity
I stand strong both below and above
Alone I am an oddity
A scar revealing lack of love

Though I may be lost, I am still found
And I can bring you treasure…
if I am but small. Yet if I am large
I can cost you at great measure

I rose after the fall of my predecessors
Who gladly gave up their throne
But I shall have no successors
To rise up when I am gone

My unveiled sight can brighten your day
But I can destroy what comes near
I will help you form what you will say
Now guess what I am, my Dear.

Highlight the Answer---> TEETH