Dummy and thumb-sucking: do they affect the teeth?

In short: the dummy and thumb-sucking are not a concern in the early years: if the habit is given up around 2-3 years of age, it normally leaves no lasting effects. The problem is when it’s prolonged: it can push the front teeth outwards and alter the bite and the palate. Thumb-sucking is usually harder to correct than a dummy.

Why can they have an effect?

Because a young child’s mouth is still developing and very mouldable. A dummy or a thumb kept in for many hours a day, over years, exerts a constant pressure that can:

• Push the front teeth outwards (they stick out).
• Create an open bite (the upper and lower teeth don’t fully close together).
• Narrow the palate.

The key isn’t so much the habit itself as how long it’s kept up.

Up to what age is there no need to worry?

A practical reference:

Age	Recommendation
0 – 2 years	Normal, no concern
2 – 3 years	A good time to start giving it up
3 – 4 years or more	Worth consulting and helping them stop

If the child gives up the habit within that 2-3 year window, the most usual outcome is that no lasting effects remain and, if small changes did occur, they often correct themselves once it’s given up.

Dummy or thumb: which is worse?

Curiously, the thumb tends to be more tricky. The dummy can be “taken away” physically when the moment comes; the thumb is always available and sometimes the habit drags on for more years and with more force. That’s why the thumb sometimes leaves more of a mark.

How to help them stop?

Without drama or punishments, which tend to be counterproductive:

• Do it gradually and with positive reinforcement (rewarding progress).
• Take it away first during daytime moments and leave the sleep one for last.
• Look for alternative comforts (a cuddly toy, cuddles).
• If it’s proving hard, ask the dentist or paediatrician for help.

When to consult

If your child is 3-4 years old or more and still has the dummy or thumb, or if you already notice the teeth “sticking out” or not closing properly, it’s a good time for a check-up. Often it’s just a matter of keeping an eye on it; in some cases, early interceptive orthodontics sorts it out easily.

We’ll check your little one over without scaremongering and tell you whether action is needed or just waiting. The first visit is free. Book an appointment whenever you like.