Is the Onlyone FC5090 good for braces?

Yes. The lower pressure settings and standard jet tip work around brackets and wires, and the 300 ml tank gives enough water for a full session. Use the soft setting first if your gums are sensitive.

How long does the battery last between charges?

Onlyone claims up to 30 days of typical use per charge, and a full charge takes about 3 hours over USB. Heavy daily use will shorten that, but most users charge it roughly monthly.

Can I use it in the shower?

Yes. The IPX7 rating means it can be submerged briefly and used in wet conditions, so shower use is fine. Do not charge it while wet.

How does it compare with a Waterpik cordless flosser?

It has a larger 300 ml tank and longer claimed battery life than most Waterpik cordless models, but fewer pressure settings and less brand support. Waterpik offers more tip types and a wider pressure range on its premium units.

The flosser, five interchangeable tips and a USB charging cable. A wall adapter is not included, so use any standard 5V USB charger.

Is it safe for sensitive gums?

Start on the lowest 50 PSI setting and work up. The four-step range lets you stay gentle, though there is no dedicated extra-soft mode like some premium flossers have.