Though I can confirm the cause only after an evaluation but it is possible that infected tooth can lead to sore throat. Whenever there is a cavity or tooth decay
the food gets lodged in the tooth
. The bacteria feed on the rotted foodstuff and eventually enter the Eustachian tube through the infected tooth. The Eustachian tube connects the throat, teeth; ears, eyes and head, infection that enters via the tooth can migrate or settle at one or more of these points causing pain.