That is called a loading dose, and it so that it brings up the A/B to a therapuetic level in your blood stream. Erythro would not be my first choice but it would work probably.. Sounds though, like you should find yourself a new dentist.
it is a topical antibiotic and should only be used for short periods of time, like right after surgeries, or gum work. It will stain teeth dark brown, so it is not recommended for long term use.
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