Silicone is non toxic to humans.
The only way that silicone would become toxic to a human is if the silicone were burning and then producing fumes that could be toxic to breathe in.
But silicone itself is safe for humans and silicone is used in medical equipment and even baby bottle nipples and pacifier nipples.
The baby pacifiers and baby bottles nipples are made from silicone which is inside the baby or toddlers mouth.
If the silicone were toxic to humans then the baby bottle nipples and pacifier nipples that are made of silicone would make the baby or toddler or child sick.
So no silicone is not toxic to humans.