Toothbrushing Triggers Rare Seizures
Researchers Report 3 Patients With Reflex Epilepsy Suffer Seizures From Brushing Teeth
March 5, 2007 -- Australian researchers report three rare cases of people
with epilepsy in whom toothbrushing triggered seizures.
The risk of such seizures is probably zero for people without epilepsy.
The three patients all had reflex epilepsy, in which seizures can be
provoked by specific stimuli instead of happening spontaneously.
What's more, all three patients had a lesion in the same brain area,
according to brain scans using magnetic resonance imaging (MRI).
Researchers including Wendyl D'Souza of Australia's University of Melbourne
describe the cases in Neurology.
One patient was a 31-year-old woman with reflex epilepsy. She tended to have
seizures when she brushed her teeth vigorously. She reported an aura described
as a "numb feeling in her head."
Another patient was a 33-year-old man with reflex epilepsy in whom
toothbrushing triggered tongue tingling, jaw tightening, salivating, and
occasional twitching on the right side of his face for 60-90 seconds. He was
most likely to have seizures while brushing his right lower teeth. But he also
had seizures while eating potato chips.
The third patient was a 42-year-old man who had cramping in his tongue and
left jaw when brushing his teeth or, occasionally, when eating.
The rhythmic action of toothbrushing might stimulate the brain area that
triggered the seizures, note D'Souza and colleagues.
Toothbrushing, with its persistent rhythm, is probably more likely to
stimulate that brain area than chewing, according to the researchers.