ANSWERS: 1
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Frontline kills and prevents fleas and ticks for 2 to 3 months. According to the Official Frontline website, pet owners who see fleas in the days following application should take it as a sign that the medicine is working and the fleas are moving to the top of the fur to die.
Source:
GaltTech.com: Getting Rid of Fleas - Frontline vs. Advantage
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