Aids to support good pencil grip can be very useful for some pupils. However, one of the issues with their use is that, when a pupil has not got the pencil grips to hand, they revert back to the original poor grip position.
Pencil grip aids generally do not correct the grip, they just force the hand and fingers into the correct position for writing. To correct the grip permanently the physical factors that have created the incorrect grip need to be addressed.
The use of grips can encourage a pupil to write more fluently, building their self-esteem, whilst you work on correcting the factors that have caused a poor grip to form. The long-term aim must always be to get the pupil to grip the pencil correctly without the use of aids.