are intended to undergo chemical change in the body in which case they are classified as class IIb, except if the devices are placed in the teeth; or
má beartaíodh iad le dul faoi athrú ceimiceach sa cholainn, agus sa chás sin tá siad aicmithe mar aicme IIb, seachas má chuirtear na feistí sna fiacla; nó