Puffing and silica gel are both filling materials allowed by the health department, so they are very safe. However, compared with silica gel, the swelling body is easier to blend with the tissue and softer, but the disadvantage is that the technical requirements for doctors are very high, because the material is soft, so it is not easy to carve. The specific materials can be decided according to their own specific conditions. If you don't understand anything, you can consult Dalian No.4 Middle School! 0! Three o'clock sharp! Online doctors, they will answer your questions.