Children's dental guide
4 min readThumb sucking and dummies
Thumb sucking and dummy use are common. Effects on teeth depend on frequency, intensity, duration and the child's stage of development.
Many babies and children suck a thumb, finger or dummy for comfort. It is not a reason for blame, and habits can be difficult to change.
Dental effects are not the same for every child. If you notice bite changes, speech concerns, sore skin or worries about stopping, ask a dentist, health visitor or other appropriate professional.
At a glance
Understand the habit
Common behaviour
- Thumb, finger and dummy habits are common in young children.
- Effects depend on how often and how strongly the habit occurs.
- Timing matters because baby and adult teeth develop at different stages.
Reduce dental risk
Gentle support
- Avoid dipping dummies in sweet foods or drinks.
- Use calm, non-shaming support if a child is ready to reduce a habit.
- Ask for advice if the habit is persistent or causing concerns.
Get advice
Bite changes
- Dental advice is useful if the front teeth do not meet or the bite changes.
- Ask for advice if a dummy breaks, causes soreness or affects speech.
- Prompt help is needed for dental pain, swelling or injury.
Contents
Habits can affect developing teeth differently
A sucking habit may affect tooth position or bite in some children, especially if frequent, forceful or prolonged. It is not possible to predict changes for an individual child online.
Possible causes or contributing factors
- Comfort, sleep association or self-soothing.
- Habit strength, frequency and duration.
- The child's age and stage of tooth development.
What you can do now
- Keep wording calm and supportive.
- Avoid sweetening dummies or letting a child run with one in the mouth.
- Ask a dentist if you notice tooth or bite changes.
What not to do
- Do not shame or frighten a child about the habit.
- Do not assume bite changes will correct without advice.
- Do not use products or devices without professional advice.
When to ask a dentist
- The habit continues and you are worried about teeth or speech.
- You notice an open bite, tooth movement or cleaning difficulty.
- A child has soreness, dental pain or a damaged tooth.
When prompt advice is needed
- A dummy or appliance fragment is inhaled or causes choking.
- There is dental trauma, swelling or severe pain.
- A child has mouth injury or bleeding that concerns you.
What a dentist or relevant professional may assess or do
- Assess tooth position, bite and oral soft tissues.
- Give age-appropriate advice on habit reduction.
- Discuss whether orthodontic advice may be useful later.
Frequently asked questions
Will thumb sucking damage my child's teeth?
Not necessarily. Effects depend on the habit and the child's development. Ask a dentist if you notice bite or tooth changes.
Should I force my child to stop immediately?
A supportive approach is usually better than shame or punishment. Ask for professional advice if stopping is difficult.
Can dummies cause decay?
Sweetening a dummy can increase decay risk. NHS guidance advises not dipping dummies in sweet foods or drinks.
Explore children's dental health
Read supportive Odenta guidance and ask a dentist if you are worried about your child's teeth, bite or habits.
Browse children's dental guidesOfficial sources
These links open external official guidance pages for further help.
Content reviewed by Dr Majid Saeed · 13 July 2026
References used for this guide are listed above.
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