Silicone does not smell before first use, but after some time you may notice an odour. This is actually the results of food oils and washing detergents clinging to each other on the surface of the product and not the silicone itself. This is because no chemicals are added to the silicone to make it rigid.
Silicone dinnerware are poreous in nature and therefor can absorb smells from food or soap, but there are several ways to remove them:
Baking
Preheat the oven to 350°F and bake the silicone for 10–15 minutes. This method works best for 100% silicone products.
Boiling
Baking soda
Lemon juice
Vinegar
To prevent smells from forming, make sure you clean your dinnerware right away and dry with a towel after each use. You can also use a detergent that doesn't contain additives or fragrances.