Thumb sucking can be a very entertaining habit for your child. However, your child's calming habits have many consequences later on, including damage to their teeth and jaw. Therefore, as a responsible parent, you should limit thumb sucking as much as possible.
If you have to ask, most parents will tell you how annoying it is to thumb sucking. They know it's bad and dangerous. To know more about how to stop sucking thumb visit https://www.amazon.co.uk/Age-2-7-Stop-Thumb-Sucking/dp/B00VQU2DZS.
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Children return to thumb sucking to feel safe and secure in the environment. They have to stop it when permanent teeth appear which are around six years old. If the thumb continues to suck after a certain age, it will deform the teeth and then they may have to wear braces.
Thumb sucking also causes many other problems such as bacterial buildup and infection. It's best to make sure you handle it as positively as possible. Don't punish your children for this as this will make them angry and even more insecure. It is better to try to wait and be as gentle as possible when correcting them.
There are other comfort zones you can give your child such as a warm blanket, their favorite toy, or accompanying them before bed to make sure they don't think about thumb sucking.
You should also be alert and pay attention to whether your child is using thumb suckers. Find out the triggers, timing, and related factors so you can move on and avoid similar situations for your child. Try to mislead your child as soon as they try to put their thumb in their mouth.
The right kind of positive reinforcement and good parenting habits will definitely help you achieve this with the least amount of disappointment.