My lip is still numb after a dental procedure - is that a stroke?

Usually not - dental anaesthetic and minor nerve irritation are common, benign causes that often settle. But numbness that comes on suddenly and unexpectedly (not right after an injection), or with any face droop, arm weakness or speech trouble, is a stroke emergency - call 995. Numbness lasting longer than your dentist expected should be reviewed by them.

How do I tell Bell's palsy from a stroke?

You should not try to at home. Both can cause sudden one-sided facial droop, and the safe move is to treat it as a stroke and call 995 immediately - doctors will distinguish them urgently. Bell's palsy is diagnosed by clinicians after stroke has been ruled out.

The numbness went away after a few minutes - do I still need help?

Yes. Facial numbness that comes on suddenly and then resolves can be a TIA ("mini-stroke") - a serious warning that a bigger stroke may follow. Call 995 the same day even if you feel completely normal again, as the NHS advises hospital assessment even when symptoms disappear.

Can anxiety cause facial numbness?

Yes - over-breathing (hyperventilation) can cause tingling around the mouth and in the hands, and usually settles as breathing calms. But this is a diagnosis of exclusion: sudden numbness, or numbness with any FAST sign, needs emergency assessment first.

Facial Numbness: When It Is a Stroke and When to See a Doctor (SG)

Written & reviewed by the BestDoctors.sg editorial team · Last updated 29 Aug 2026 · General information, not medical advice

Quick answer. Facial numbness – reduced or altered feeling in part or all of the face – often has an ordinary cause, such as recent dental work, a trapped nerve, migraine or anxiety. But the one pattern never to miss is stroke: call 995 immediately if facial numbness is sudden, or comes with a face drooping on one side, arm weakness, slurred speech, or sudden vision or balance problems – use FAST (Face, Arms, Speech, Time). A brief episode that fully passes can be a “mini-stroke” (TIA) and still needs 995. Do not try to tell a stroke from Bell’s palsy at home. This is general information, not a diagnosis.

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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.

What facial numbness means

Facial numbness is reduced or altered sensation in the face – numbness, tingling, pins and needles, a heavy or tight feeling, or skin that feels dead to the touch. It can affect one small patch (a cheek, lip, chin or forehead), one whole side, or, less often, both sides. It helps to distinguish numbness (altered feeling) from weakness or droop (the face will not move) – the two often occur together, and when they come on suddenly, both point to stroke. Worth noting from the outset: which part of the face, which side, whether it came on suddenly or gradually, and whether movement such as a smile or a blink is affected too.

Common, usually less-serious causes

Several ordinary problems cause facial numbness. Dental problems or recent dental work are a very common, benign cause – local anaesthetic wears off, and dental infections or nerve irritation can numb the lip, chin or cheek; numbness lasting well beyond what your dentist expected should be reviewed by them. A trapped or compressed nerve, including from sleeping position, can numb an area. Migraine aura causes numbness or tingling that spreads over minutes, often with visual disturbance and headache, in someone with a migraine history. Anxiety and over-breathing can cause tingling around the mouth and hands. Shingles on the face causes pain or tingling then a rash, and needs prompt care if it affects the eye. Vitamin B12 deficiency can cause gradual pins and needles.

Bell’s palsy and other serious causes

Bell’s palsy causes sudden weakness or drooping of one side of the face, often with an altered or numb feeling. Crucially, it can look like a stroke and must be told apart urgently – the safe rule is to treat any sudden one-sided facial droop as a stroke and call 995, rather than assuming Bell’s palsy at home; doctors distinguish them after ruling out stroke. The serious causes not to miss are stroke and TIA (sudden, and covered below), and less commonly multiple sclerosis, where facial numbness can be a presenting feature – but in a gradual or relapsing pattern over days to weeks, not the sudden single event of a stroke. Rarely, a brain tumour causes progressive numbness with other neurological signs evolving over time.

When it is an emergency (call 995)

Call 995 immediately – and do not drive yourself – if facial numbness is sudden, or comes with any of: a face dropped on one side or an uneven smile; arm or leg weakness or numbness, especially on one side; slurred, jumbled or lost speech, or trouble understanding; sudden vision loss or double vision; sudden loss of balance or coordination, or sudden confusion; or a sudden severe “worst-ever” headache, or symptoms with a stiff neck and fever. Remember FAST: Face, Arms, Speech, Time. And note the vital point from the NHS: even if the symptoms fully pass within minutes, still call 995, because a brief episode can be a TIA – a warning that a bigger stroke may follow. Note the time symptoms started; treatment is time-critical.

When to see a doctor soon

Not all facial numbness is an emergency. See a doctor promptly, but not as a 995 call, for facial numbness that is gradual, persistent or recurring, especially with other neurological symptoms such as vision changes, tingling elsewhere, or unsteadiness; for numbness after dental work that is not settling; or for a painful rash near the eye (possible facial shingles, which needs prompt care to protect vision). Brief, clearly benign numbness with an obvious cause – wearing-off dental anaesthetic, or tingling with anxiety that settles – and no other neurological features can usually be watched, with a review if it persists or recurs.

What to note and staying safe

The single most important habit is this: if numbness is sudden or there is any FAST sign, do not wait, do not drive yourself, and call 995 – and note the exact time symptoms began, as this guides treatment. For clearly mild, benign numbness, record the onset (sudden versus gradual), which part and side, associated symptoms (headache, rash, vision, weakness, speech) and any triggers, and review it with a GP or polyclinic if it persists or recurs. If shingles affects the eye or the numbness involves the eye, seek care promptly to protect vision. Do not start any medication yourself for facial numbness.

Getting it checked and the bottom line

For sudden or FAST-positive symptoms, the pathway in Singapore is A&E and 995 – stroke care is time-critical. For gradual or persistent numbness with no emergency signs, a GP or polyclinic can assess you and refer to neurology if needed, and may arrange tests depending on the picture. The bottom line is simple and safety-first: most facial numbness is benign and settles, but the pattern that matters above all is sudden onset, or numbness with any face, arm, speech, vision or balance change – treat that as a stroke and call 995, even if it passes. When in doubt, it is always safer to be assessed.

Related “when to see a doctor” topics

Sources

NHS – Stroke: nhs.uk
NHS – Stroke symptoms: nhs.uk
NHS – Transient ischaemic attack (TIA): nhs.uk
NHS – Bell’s palsy: nhs.uk
NHS – Shingles: nhs.uk
NHS – Multiple sclerosis: nhs.uk

General information only. This guide helps you decide when a change is worth getting checked – it does not diagnose you or replace advice from a doctor. Most such changes have ordinary causes, but some need assessment, so if a change is persistent, unexplained, or worrying you, see a doctor. Call 995 or go to A&E for any sudden change – sudden face, arm or leg weakness or numbness, sudden trouble speaking, sudden loss of balance or vision, or a sudden severe headache – as these can be signs of a stroke, and act FAST even if the symptoms pass. Also seek emergency care for a severe, rigid or very painful abdomen, or for sudden confusion with fever. This guide does not give medication doses; never start, stop or change prescribed medicine without medical advice.