DS3 is very much a sensory seeker and always has something in his mouth- even dips onto the floor to pick things up and pop in his mouth (yuck)
A few of the people at Uni use chewy tubes and i've had a look and they seem ideal, but the lady at Uni said they were only for kids with severe LD (DS3 is mod - severeasd, best described by the teacch term'concrete', or markedly functionally impaired).
Looks ideal tome,they ahve them on ebay for £8 and I can't see any reasons why not unless anyone knows one?
ta