A dental impression tray comprising a dental impression channel and an outer surface which outer surface presents an inclined surface is capable of being applied to a tray for paediatric primary anterior dentition impression taking significantly improving paediatric compliance in the taking of dental impressions so negating the need for the use of a general anaesthetic and to an impression tray for self-formed dental impression taking for use in making a mouth guard which facilitates improved accuracy of the dental impression and thus of the mouth guard.