First and foremost, remember that most children use sucking their thumb as a way to self-soothe and if possible, the coping mechanisms itself is what needs to be exchanged for something else. If the child has reached an age where they can comprehend why it has become a problem, simply explain to the child why it's a problem and try to reason with them.

Make them aware that it could make their teeth crooked and use that to help them realize it can have a negative effect. The ADA (American Dental Association) says that, generally, children who are just resting their fingers in their mouths out of habit will easily be broken of it, whereas children who are aggressively sucking may have a harder time with the idea to change. You can get rid of your child’s thumb-sucking habit by buying tguard thumb via https://www.amazon.com.au/Age-2-7-STOP-Thumb-Sucking/dp/B00VQU2DZS

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If your child is persistent, here are a couple of hints and tricks to try. Be sure to do this every time before their normal habit time of sucking their thumb, like before nap and bedtime.

• Place a bandage over their thumb
• Put thumb in vinegar or other bad-tasting substance
• If your child sucks their thumb when they are anxious, try to replace a coping mechanism to help soothe the anxiety another way
• Let the child help you choose the method to help them stop (If old enough)
• Have you dentist/hygienist help explain why they should stop

Finally, be sure to always use positive reinforcement. When your child isn't sucking their thumb, tell them what a great job they are doing, and make sure they are rewarded!