Thumb Sucking and Pacifier Habits: When Should Parents Worry?
Thumb sucking and pacifier use are normal, natural behaviours in infants and young toddlers. Most children stop on their own between ages two and four. However, if these habits continue beyond the age of four or persist after permanent teeth begin to come in, they can affect the alignment of teeth and the development of the jaw.
What the Experts Say
The Canadian Dental Association provides clear guidance for parents:
"Sucking is a natural reflex for babies. Most children stop sucking on thumbs, pacifiers or other objects on their own between two and four years of age. If your child is still sucking after the permanent teeth have started to come in, it may be time to take action to break the habit."
— Canadian Dental Association, Pacifiers and Thumb Sucking
The American Academy of Pediatric Dentistry adds:
"If the habit continues beyond the age when permanent teeth start to erupt, your pediatric dentist may recommend a mouth appliance to help your child stop."
— American Academy of Pediatric Dentistry, Parent FAQ
How Thumb Sucking Affects Teeth
Prolonged thumb sucking or pacifier use can cause:
- Open bite — the front teeth do not meet when the mouth is closed, leaving a gap
- Overbite — the upper front teeth protrude forward over the lower teeth
- Crossbite — the upper jaw narrows, causing the upper teeth to bite inside the lower teeth
- Changes to the roof of the mouth — the palate can become narrower or develop a higher arch
- Speech difficulties — misaligned teeth and palate changes can affect pronunciation
The intensity and duration of the habit matter. A child who passively rests their thumb in their mouth is less likely to experience dental problems than one who vigorously sucks.
Pacifier vs Thumb: Is One Better?
The CDA notes that pacifier habits are generally easier to break than thumb sucking because the pacifier can be taken away. Both can cause similar dental issues if the habit continues too long.
If your child uses a pacifier:
- Never dip it in sugar, honey, or other sweeteners
- Keep it clean
- Do not tie it around your child's neck (choking hazard)
- Begin weaning between ages two and three
Tips for Helping Your Child Stop
The Ontario Dental Association and CDA suggest these positive approaches:
- Praise your child when they are not sucking their thumb rather than criticizing when they are
- Identify triggers — children often suck their thumb when tired, anxious, or bored. Address the underlying cause.
- Offer alternatives — a comfort toy, blanket, or other soothing activity
- Use gentle reminders — a bandage on the thumb or a sock at night can serve as a reminder without punishment
- Involve your child — older children can be part of the plan to stop, which gives them a sense of control
Avoid harsh methods like bitter-tasting nail polish or scolding. These can create anxiety and may make the habit worse.
When to See a Pediatric Dentist
If your child is still actively thumb sucking or using a pacifier past age four, or if you notice changes in your child's teeth or bite, it is a good time to consult a pediatric dentist. Dr. Gumber can assess whether the habit has affected your child's dental development and discuss intervention options if needed.
In some cases, a simple habit-breaking appliance (a small device placed in the mouth by the dentist) can help children who have difficulty stopping on their own.
Habit Counseling at Growing Smiles
At Growing Smiles Children's Dentistry, habit counseling is part of our comprehensive pediatric dental care. Dr. Gumber takes a gentle, positive approach to helping children and parents address thumb sucking and pacifier habits.
Both our LaSalle (1400 Front Rd) and Windsor (6925 Enterprise Way, Unit 2) locations are accepting new patients.
Call 519-800-4500 to discuss your child's oral habits.
Sources: Canadian Dental Association — Pacifiers and Thumb Sucking, American Academy of Pediatric Dentistry — Parent FAQ, Ontario Dental Association — Tips for Kids