hello and welcome to hcm forum Dove1,
according to the dental history provided by you it seems that you had undergone tooth preparation prior to cementation of a bridge.
i would like to inform you that local anesthesia(novacaine) cannot change the tone or even affect your vocal cords in any way. i understand that your voice has become raspy following the dental work, for this clinical check up is required, in order to confirm the cause. therefore, i would advise you to visit your dentist
i assume that you do not suffer from any respiratory infection.
on the whole, novacaine cannot affect your voice,
i hope i answered your query,
i wish you good health.