The War on Thumb-Sucking
Most pediatricians will demand that you kick your child’s thumb sucking and pacifier reliance to the curb by the time they are three. If you wait much longer than your child will end up with dental health issues that only many years and lots of money can fix.
There are a lot of techniques out there when it comes to kicking oral fixations to the curb, but your best bet is to ask your dentist. Your dentist can give you insight into the types of issues that your child will face if they continue on with the pacifier or thumb sucking.
To be frank, your child will put up a fight and do their very best to hold onto the thing that gives them comfort, but many things can help deter your child from sucking their thumbs. Your dentist could have good ideas to help, and even tools to get your child to stop the habit.