Why people mix up overjet and overbite

Both conditions involve the upper front teeth sitting in front of the lower teeth — but the direction of the problem is different. One is horizontal, the other is vertical. Understanding the difference helps you know which treatment is right for your smile.

What is an overjet?

An overjet is when the upper front teeth protrude forward over the lower teeth.

This is a horizontal issue.

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Common signs of an overjet

• Upper teeth stick out noticeably
• Difficulty biting into foods
• Speech changes (like slight lisps)
• Lips don’t fully close without effort
• Increased risk of chipping front teeth

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What causes an overjet?

• Genetics (jaw size or shape)
• Thumb sucking or dummy use in childhood
• Tongue thrusting
• Missing or misaligned teeth
• Underdeveloped lower jaw

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What is an overbite?

An overbite is when the upper front teeth cover too much of the lower teeth.

This is a vertical issue.

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Common signs of an overbite

• Lower teeth disappear when you bite down
• Upper teeth overlap more than normal
• Jaw discomfort or tension
• Wear on lower teeth
• Gum irritation behind upper teeth

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What causes an overbite?

• Genetics
• Deep bite development during childhood
• Grinding or clenching
• Small lower jaw
• Tooth wear that changes bite height

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Overjet vs overbite

How overjet and overbite are treated

Clear aligners

Aligners can correct many mild to moderate cases by gradually repositioning teeth and improving bite alignment.

Braces

Used for more complex bite issues or when significant movement is needed.

Growth modification (children)

Helps guide jaw development during growth stages.

Surgery (severe cases)

Reserved for major jaw discrepancies that can’t be corrected with orthodontics alone.

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Which condition is more serious?

Neither is “worse” - it depends on:

• how much the teeth protrude or overlap
• whether the bite affects speech or chewing
• jaw comfort
• long‑term wear on teeth

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A dentist can assess your bite through photos and recommend the safest, most effective treatment.

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How Toothfairy helps with bite issues

Photo‑based bite assessments

Upload images to get quick guidance on whether you have an overjet, overbite or both.

Dentist‑led straightening plans

Clear aligner treatment designed and monitored by UK‑licensed dentists.

Remote check‑ins

Track progress without frequent clinic visits.

Clear next steps

You’ll know whether aligners, braces or another option is right for your case.