We had our dog on frontline and got them about one year, here are some ideas that might help you! If you see them they are in the carpet! It does not take long for them to reproduce!!
Vacum alot, and I mean alot. Then make sure you get rid of the bag or dump the tube outside.
May sound strange, but if you have a plug in close to the carpet, place a night light and then a pan with soap in it, under the light. For some reason they will go to the light and then land in the water. They will drown in the soapy water, and you get to see them!
Wash the bed that they lay in alot.