Local anaesthesia: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Local anaesthesia

Sample item

Which sign may indicate local anaesthetic systemic toxicity after an injection?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Tinnitus, metallic taste, or perioral numbness

Early local anaesthetic toxicity can include neurological symptoms such as tinnitus, metallic taste, circumoral numbness, agitation, or seizures at higher exposure.

Option by option

  • A. Painless calculus on lower incisors

    Calculus is mineralized plaque, not toxicity.

  • B. Tinnitus, metallic taste, or perioral numbness (correct)

    Correct: these neurological symptoms can precede serious toxicity.

  • C. A new fissure caries lesion

    Fissure caries does not result acutely from injection.

  • D. Gradual plaque accumulation over months

    Plaque accumulation is a chronic hygiene issue.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is B, Tinnitus, metallic taste, or perioral numbness. Early local anaesthetic toxicity can include neurological symptoms such as tinnitus, metallic taste, circumoral numbness, agitation, or seizures at higher exposure.

Why is "Painless calculus on lower incisors" not the answer?

Calculus is mineralized plaque, not toxicity.

Why is "A new fissure caries lesion" not the answer?

Fissure caries does not result acutely from injection.

Why is "Gradual plaque accumulation over months" not the answer?

Plaque accumulation is a chronic hygiene issue.

What concept does this question test?

It tests Local anaesthesia in Dentistry. The correct option holds because: Correct: these neurological symptoms can precede serious toxicity.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Local anaesthesia?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.