The second one is the one that makes the most sense
Answer:
Es el primer dentista en trabajar aquí.
Explanation:
according to Google translate, the correct spanish equivalent of;
"He is the first dentist to work here" is;
" Es el primer dentista en trabajar aquí.".
reference: Google translator mobile app
Soy is the spanish word for “I am”
7 or 140 ones not have the same value as 14 tens