no it does not. tetanus shots only protect against one thing. tetanus. although not specifically approved for cold sores anti-herpetic drugs used for genital herpes and other herpetic infections (like shingles and chicken pox) may help. these would include medications like acylovir famvir etc. you would need to address this with your medical provider.
does a tetanus shot help prevent or lessen the occurance of cold sores