I was just looking at the new products released today, and one of them had a safety rating of 10, so I checked the material--it's TPR Silicone. In the past, I've only seen TPR Silicone rated as a 6 on the materials safety scale. Why did this change? Is it truly as safe as a pure silicone toy? To my knowledge, you can't throw a TPR Silicone toy into a pot of boiling water to sterilize--can anyone enlighten me on this change?