I bought a few colours of these robot chew necklaces as an adult to stop me chewing my nails and it has worked... I bought extra necklace length just in case it was too short since it's marketed for kids but didn't end up needing it. Child length is perfect for adults to be able to bite and I am a bigger person it still hangs down long enough I can see him! Love it so much, great texture to bite where has enough give yet still conforms back to shape and doesn't leave chew marks.
good colours and designs