I purchased 2 packs for these and I sanitized the 'flower' as it fell on the garage floor but it melted and became really hard, so don't do that :). I have offered them to my son but he only places them in his mouth for a few minutes and then tosses them away. We keep them in the fridge and we have been offering them to him as everything in sight heads straight to his mouth but he doesn't seem to care much for them. I intend to keep them and use them when he is much older as I have been told that these are great especially the heart shaped one which is supposed to be very good when they are sprouting the back teeth. So for now, I will say "wait until he is older to try again" and I will be happy to update my review accordingly.