Sucking on fingers or thumbs is healthy and normal when children are very young. Most children stop somewhere between two and four years of age.
In many children, sucking a dummy, thumb or finger can cause changes to the teeth and jaws. The younger the age at which a child stops, the more likely their teeth and jaws will correct the growth problems naturally. If you want to buy thumb sucking guard in order to stop thumb sucking, then you can buy it from amazon Canadian website.
If children are still sucking their puppets, the thumb or finger when their adult teeth come through there is a much higher risk of permanent changes in the growth of the teeth and jaws.
Problems caused by thumb or finger sucking
Long thumb-sucking can cause:
Overbite (buck teeth) – for example, the front teeth can be pushed further ahead than they should. It can change the shape of the face
Open bite is when the upper and lower front teeth do not meet when the mouth is closed (usually the upper teeth slightly overlapping the lower teeth). If there is a gap between the upper and lower front teeth where the tongue could poke through, this could be an open bite
lisp – children of pre-school who suck their fingers and thumbs to push their teeth out of their normal position. It can interfere with the formation of certain speech sounds correct.