Thumb-sucking isn't harmful at this stage
There are so many ways to break a child's thumb-sucking habit - bitter liquids on the finger (Thumbs is a brand available that can be painted on like nail-polish - Tabasco will cause serious injury to her), orthopaedic plaster on the hand, habit-breaking appliances in the mouth, etc. However, a gentle and frequent removal of the finger at this stage may be all that is required. The raw finger is best treated by keeping it dry and clean (don't let the saliva dry on it), with an antiseptic cream applied during the times she's not indulging in the habit. Till the age of 3 or 4 years, her habit will not be detrimental to her mouth and alignment of teeth. As she grows older and starts to understand things (say 2+ years), it would be likely that she'll automatically quit from parental persuasion and peer pressure without your needing to use any special method. But for the time being, just verbally dissuade her from sucking the thumb when she is awake, and gently remove the thumb and restrain the arm when she's asleep (even putting a sock on the hand will do the trick). You will find that during the few minutes that she takes to fall asleep, her need for the thumb will be the greatest, and this is the particular time that she should be dissuaded/restrained from putting it in her mouth. No scolding, no tantrums, no threats, and no restraints when she's awake. I hope this advice helps, from someone who's a dentist AND has an 8-year-old daughter who used to thumb-suck!
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