Work started in April and ran to the end of June, with the last scheme in Stilebridge Lane, Linton.
Retread involves planing the old road surface and breaking it up, with the broken material levelled out to form the new road base.
A fresh bitumen emulsion is mixed into the broken material to bind it and the road mix is compacted and sealed to provide a new, levelled and pothole free running surface.
KCC Cabinet Member for Highways and Transport David Brazier said: “As this method recycles the existing road, with fresh stone brought in only if required, a significant reduction in costs, material and CO2 admissions is the end result.
“Retread is a cost effective and environmentally-friendly treatment process compared to more traditional resurfacing methods.”
The cost to KCC is around £16 to 18 per square metre compared to traditional resurfacing which can range between £35 and 50 a square metre.
Kent has one of the largest and most heavily trafficked road networks in the UK but is also a very rural county and requires a careful balance of spending limited resources between main roads and the rural network.
Mr Brazier added: “The rural network is vital to the economic life of many residents and retread is the ideal engineering solution for the maintenance needs of our rural roads. It is economical and allows us to renew the roads that would never be affordable using traditional resurfacing methods.”