Deductions & credits

I am still confused a bit.   So the income is $103,885, 1/2 SE tax is $7339 and the PTC is $2132.   I can't figure out how the $3572 I paid in premiums reduced to $738.   

 

Also, on a side note:  I paid $335 for a dental plan that wasn't through the exchange.  Where do I enter this expense?

SORRY, THIS WAS SENT AT THE SAME TIME SOMEONE WAS REPLYING.