My toddler started chomping on his friend's at daycare so we had to come up with a solution before they kicked his little buns out of there. We found a teether in the shape of a truck and slid it into one of these necklaces - problem solved! The breakaway feature is very reliable and I like that I can cut the cord to any length I need by sliding off the end cap. They wash up easily and I like having a bunch in the bag because several have already been mysteriously lost to the daycare vortex.