Can I use Plaster of Paris to mold my face?

It would be a safer idea to make a silicone mold of your face first, then to fill that mold with plaster, if your plan is to make a casting. If you use plaster to make a mold, and something goes wrong, you could potentially hurt or suffocate yourself. Silicone, though not completely safe to use, is safer, and could be peeled away from skin much more easily. Please be sure to use silicone that is formulated for mold making, and for prolonged contact with skin. If you are serious about facial mold making, contacting someone who specializes in the field would be a great way to find out how to safely use plaster for this purpose.