Hi welcome to health care magic!
You have not mentioned your boyfriends age?it is quite common for individuals to develop wisdom teeth from 16 to 25 or even later.
I would suggest that you consult a dentist
in case your boyfriend has more that 32 teeth!You may also clarify with the dentist regarding the number of permanent teeth
and whether he has an extra molar in case you have been mistaken.
Marfans syndrome does not cause excess teeth.teeth are not made of cartilage
hence the two may not be associated.
hope this helps!