I have read reports of damage and breakage from boar bristle brushes on hair and beauty forums, I am not convinced there is any science showing they are any better than any other low snag brush. The claims seem to come from companies selling the brushes, for example Kent claim "Natural boar bristle will never damage human hair as they are both made of the same protein."
Completely illogical, human hairs can damage one another through friction!
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.