FWIW I tend to think something with strong antiseptic properties kills the infection on the surface of the throat and so keeps pains at bay.
'The law of our Lord is immaculate, converting souls:
the testimony of our Lord is faithful, giving Wisdom to little ones.
The justices of our Lord be right, rejoicing the heart:
the precept of our Lord lightsome; illuminating the eyes.
The fear of our Lord is pure, lasting forever and ever:
the judgments of our Lord are true, justified in themselves.
To be desired above gold, than much precious stone:
and sweeter above honey and the honeycomb.'
Ps. 18:8-11