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Key points
- A Twin Block is a removable functional appliance made of two parts, one for the upper teeth and one for the lower.
- It encourages the lower jaw to sit further forward and is used to reduce a large overjet in children who are still growing.
- It works best when worn full time, including while eating if your orthodontist advises.
- Speech can feel different for the first few days, but most children adapt quickly.
- Fixed braces are often used afterwards to fine-tune the position of the teeth.
Summary
The Twin Block is one of the most commonly used functional braces for children with sticking-out upper front teeth. Because it works with a child’s growth, timing matters, which is why an orthodontic assessment around the age of 9 to 12 can be helpful.
In this short video Dr Sarah shows what a Twin Block looks like. Whether it is the right option for your child depends on their bite, age and growth, which we check at a consultation.
Questions about this topic
What age is a Twin Block used?
It is usually used for children who are still growing, often in late primary or early secondary school age.
How many hours a day should a Twin Block be worn?
Usually full time, but always follow the instructions your orthodontist gives you.
Is a Twin Block available on the NHS?
It can be part of NHS orthodontic treatment for under-18s who meet the NHS eligibility criteria.
Will my child need braces after a Twin Block?
Often, yes. Fixed braces are commonly used afterwards to line up the teeth.