I use my Mia just once per week, as a deeper cleaning/exfoliating treatment. I use the white brush (sensitive?) and get shiny skin as well. I also assumed it was due to the effective cleansing and removal of dead skin cells on the surface. The shine is gone a few hours later, and I haven't had it show through my makeup.
Location: Texas
Type: 3b/3c (i), below shoulder length.
CO wash: A-O GPB LYY, Salon Care Honey Almond, Devacurl OC, Acure Argan Stem Cell+Argan Oil, Mill Creek Botanicals Keratin Repair
Leave-ins: BWC, KCKT, cno overnight
Styling: BRHG, MGA Sculpting Gel, A-O Mandarin Magic Gel, LOTD AVG, LALSG
DT: Kiehl's Olive Fruit Oil Deeply Repairative Hair Pak, Curl Junkie Deep Fix, Briogeo Don't Despair Repair!