Hair filler is generally 20-40 bonds placed through your hair where it appears thin. The natural wave of Great Lengths hair will instantly create fullness and volume while filling any visible gaps. Hair filler generally lasts the typical 4-6 months but can easily be topped up whenever you’re ready. From a few bonds through the sides to fill gaps, creating a halo for allover fullness, or adding highlights and balayage effects with no damage; to fashioning the perfect bangs, there is a perfect solution for everyone.