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2026-09-29 · Sound Spotlight

Meet the Sound Between Your Teeth: TH

Thai doesn't have a sound quite like English TH, so learners often reach for the nearest substitute — but this one small fricative is worth building from scratch.

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English TH — the sound in 'think' and 'this' — doesn't exist in Thai, so it's completely understandable to reach for the closest familiar sound instead, often landing on something like t, d, or s. The trouble is that TH shows up constantly in everyday English, in words like 'the,' 'this,' 'that,' 'think,' and 'three,' so substituting it can make speech feel effortful for listeners to follow, even when everything else is clear. The trick is that TH isn't as tricky as it looks: you just place your tongue tip lightly between your top and bottom teeth and push air through gently, letting it hiss quietly. Try this two-minute drill: say 'think' and 'this' slowly, actually letting your tongue peek out between your teeth for the TH sound, then pull it back for the rest of the word. Do it again with 'teeth' and 'three.' It might feel strange or even a little silly at first — that's completely normal, and it fades fast with practice. This is one of the most rewarding small habits to build.

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Sources (1)
  • Developing an AI-Powered Pronunciation Application to Improve English Pronunciation of Thai ESP Learners — Jiraporn Lao-un, Dararat Khampusaen, 2025
    • AI-mediated intervention yielded significantly greater pronunciation improvements compared to traditional teacher-led instruction.
    • Learners showed marked progress on challenging fricatives (/θ/, /ð/, /z/, /ʃ/, /h/) that are not present in the Thai language.
    • ESP contextualized practices within the AI application effectively supported targeted phonological development.

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