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Orthodontics · single question

Orthodontic treatment is CONTRAINDICATED while which habit persists?

  1. Class II division 2 malocclusion
  2. Mild open bite
  3. Active thumb-sucking habit
  4. Crowded mandibular anterior teeth
Show answer and explanation

Correct answer: C. Active thumb-sucking habit

  • A. Incorrect. Class II division 2 is a common orthodontic indication.
  • B. Incorrect. Open bite is an orthodontic INDICATION for treatment.
  • C. Correct. Active THUMB-SUCKING is a relative CONTRAINDICATION to orthodontic treatment. The persistent habit counteracts tooth movement and causes relapse. The habit should be eliminated first (habit-breaking appliance); orthodontic treatment follows after habit cessation.
  • D. Incorrect. Crowding is one of the most common orthodontic indications.

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