It is physically possible...BUT... do not do it. It can break
toes, feet, and possibly mess up tendens and muscles in the
process. It also hurts. If you want to go onto pointe then you need
to buy a real pair of pointe shoes. They are usually cheaper
online.
NO! DO NOT TRY THIS! This can break your feet. Demi pointe shoes
are for demi pointe. Pointe shoes are for pointe.
ANSWER 2
Hi, Demi-pointe shoes are used so that you can experience the
sensations of pointe shoes without going on pointe. THEY ARE NOT
FOR GOING ON POINTE IN! If you are only wearing demi-pointe shoes
then your instructor obviously does not feel you ankles are strong
enough for pointe work yet. If you do this then you face the chance
of never being able to go on pointe because you have damaged you
feet.
So stick to demi pointe shoes for demi pointe and wait a while
until your ankles are strong enough to go on pointe!
PS you should never go on pointe before you are 12 as research
has shown that the joints etc. in your feet have not fully
developed!