How to track salon inventory in Google Sheets without running out of product

Salon inventory used to feel like something I could check by opening drawers at the end of the week. That worked when there were only a few products. Once the services grew, I started missing small things: developer, gloves, wax sticks, lash pads, disinfectant, cotton rounds, back bar shampoo. None of them are expensive alone, but running out during a busy day makes the whole shop look unprepared…