More research is needed, but current data suggest that more cases of Guillain-Barré syndrome occur after the flu or an influenzalike illness than after vaccination.
Fluoride has proven benefits in the prevention of cavities, but children may be exposed to too much fluoride. Parents should know how to monitor exposure to prevent dental fluorosis.
Second-impact brain injuries that occur before the first injury has healed can cause cardiac and respiratory collapse and even death.