English /ð/ vs /z/
breathe vs breeze: teeth or ridge?

Both /ð/ and /z/ are voiced fricatives -- continuous sounds where air flows past an obstruction while your vocal cords vibrate. The distinction is purely one of position: /ð/ is dental (tongue at the teeth) and /z/ is alveolar (tongue behind the teeth at the ridge). That small shift in tongue placement is what separates "breathe" from "breeze" and "with" from "whiz."

The ABX drill plays sound A, sound B, then mystery sound X. Choose which one X matches. Five rounds is enough to start building the perceptual gap between these two sounds.

🌬️Both voiced fricatives
👅Dental vs alveolar
💨Continuous airflow
⚠️Common ESL confusion
Can you hear the difference?
How it works: You'll hear sound A, sound B, then a mystery sound X. Choose whether X matches A or B. Words are revealed after you answer.
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Listen carefully...

Mystery sound

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The problem

Why /ð/ and /z/ collapse into each other

/ð/ and /z/ share the three key features that make a sound easy to confuse: both are voiced, both are fricatives, and both are produced in roughly the same region of the mouth. The only distinction is whether the tongue is touching the teeth (dental, /ð/) or positioned at the alveolar ridge just behind them (alveolar, /z/).

For learners whose language has /z/ but not /ð/ -- which includes French, Italian, Portuguese, and many others -- the temptation to substitute /z/ is especially strong. Unlike the /d/ substitution, which at least changes the manner of articulation, /z/-for-/ð/ swaps only the place. In fast speech, the difference is extremely subtle.

The practical impact falls heavily on word-final /ð/: words like "breathe," "soothe," "bathe," "smooth," "teethe," and "with" -- where /ð/ appears at the end and the distinction with /z/ matters most.

What happens without training
  • ✗ "Breathe deeply" sounds like "Breeze deeply"
  • ✗ "Soothe the baby" sounds like "Sue the baby"
  • ✗ "With me" sounds like "Whiz me"
  • ✗ "Teethe" and "tease" sound identical
What changes with ear training
  • ✓ You start catching the dental vs alveolar shift
  • ✓ /ð/ and /z/ become distinct auditory categories
  • ✓ Word-final /ð/ in "breathe," "bathe," "smooth" clarifies
  • ✓ Your production adjusts to match what you now hear
French speakers

French has /z/ (as in "zéro") but not /ð/. French learners who know /ð/ is not a stop often substitute /z/ rather than /d/. This is closer phonetically but still creates a distinct category error, especially noticeable at word ends.

Italian / Portuguese speakers

Italian and Portuguese both have /z/ in their inventories. Learners from these languages are especially prone to /z/ substitution for /ð/. The place-of-articulation difference (dental vs alveolar) is harder to perceive than a manner difference.

Greek speakers

Modern Greek actually has /ð/ natively (written δ as in "δεν"). Greek speakers are often better at this contrast than most non-native English learners -- an interesting exception that highlights the role of native phonemic inventory.

Production guide

How to produce /ð/ and /z/

/ð/voiced th -- breathe, they, with
  1. 1. Place the tongue tip at or between the front teeth.
  2. 2. Vibrate your vocal cords and let air flow continuously past the tongue.
  3. 3. The tongue tip should feel a slight buzz where it contacts the teeth.
  4. 4. In a mirror, you should see the tongue tip at the teeth (visible contact).
Anchor words: breathe, bathe, soothe, smooth, teethe, with, clothe, loathe
/z/z -- zoo, breeze, buzz, jazz
  1. 1. Raise the tongue tip to the alveolar ridge just behind the upper teeth.
  2. 2. Do not let the tongue touch the teeth themselves -- keep a gap.
  3. 3. Vibrate the vocal cords and allow air to flow through the narrow gap continuously.
  4. 4. In a mirror, /z/ is invisible -- the tongue is behind the teeth, not at them.
Anchor words: zoo, zero, buzz, jazz, breeze, prize, jazz, freeze, nose
The mirror test

Hold a mirror in front of your mouth and say "breathe" then "breeze." On the /ð/ in "breathe," you should see your tongue tip touching or poking between your teeth. On the /z/ in "breeze," the tongue tip disappears behind the teeth. If both words look identical in the mirror, you may be using /z/ for both. The tongue must be visibly more forward for /ð/.

The elongation trick

Elongate each sound in isolation: hold "ðððð" and "zzzz" each for two seconds. Notice the tongue position difference. Then practice alternating rapidly: "ðððzzzðððzzz." When you can feel the tongue tip moving forward (to teeth) for /ð/ and backward (to ridge) for /z/, the contrast is clicking into place.

Click to hear

Minimal pairs: tap each word to hear it

English word pairs where the only difference is /ð/ vs /z/. Click each word to compare.

/ð/ voiced th
/z/
to inhale and exhale
↔
a light wind
accompanied by
↔
to move fast with a sound
to grow teeth (infant)
↔
to mock or provoke
to be very angry
↔
to grab or take hold of
to hate intensely
↔
plural of low
More /ð/ words
thethisthattheythembreathebathesoothesmoothteethewithclotheloatheseethe
More /z/ words
zoozerobuzzjazzbreezefreezenoseprizeseizeteasewasishisraise
Common questions

Frequently asked

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/ð/ vs /z/ is just one English contrast

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