The Allegro Simple Luxury Electric Toothbrush comes with three replacement brush heads in the box – in three different colors, corresponding to three firmness levels. This is a rare offering in products at this price point.

Yellow head (softest / sensitive type): Bristle diameter 0.127mm. This is the finest and softest of the three – feather‑light and gentle to the touch. Ideal for those with particularly sensitive gums, or for switching to when your gums are inflamed or irritated. The vibration feels so mild you can barely sense the bristles at all – it’s almost like cleaning your teeth with cotton. But don’t worry – cleaning power relies on high‑frequency oscillation, not bristle hardness. So even with soft bristles, every spot that needs cleaning gets thoroughly clean.

Green head (medium / cleaning type): Bristle diameter 0.152mm. This is the “all‑rounder” of the three – moderate firmness, making it the best choice for most people’s daily use. It delivers effective cleaning without irritating your gums. If you’re not sure which one suits you best, start with the green – you can’t go wrong.

Red head (firmest / polishing type): Bristle diameter 0.178–0.20mm. The stiffest and most resilient, designed for those with stubborn stains – tea, coffee, or tobacco stains – or for a deeper polishing treatment once or twice a week. When paired with Allegro’s high‑frequency oscillation, this head gives your teeth a noticeably polished feel – run your tongue over them and they’re almost impossibly smooth.

You can switch between the three heads based on your oral condition that day – choose the yellow for gentle care when your gums feel tender, the red for a deep clean when your teeth feel a bit rough, and the green for your everyday routine. One handle, three needs covered – it’s like getting three brushing experiences for the price of one.

All bristles are made of German‑imported PBT carbon filaments. Compared to ordinary nylon bristles, they offer three key advantages: First, antibacterial – PBT material naturally resists bacterial growth. Second, moisture‑resistant – water doesn’t easily penetrate to the bristle base. Third, plaque adsorption – the bristle surface is specially treated to effectively adsorb plaque and surface stains on teeth.

All bristle tips undergo a high‑precision rounding process – under a microscope, every filament end is smooth and spherical, not sharp like cheap bristles, preventing micro‑scratches to your gums and enamel.

Another thoughtful feature worth mentioning is the 90‑day color‑change reminder. After about three months of use, the bristles change color, signaling that it’s time for a replacement. No need to track dates or set reminders – just glance at the bristle color, and you’ll know instantly.

One handle, three firmness levels, and an automatic color‑change reminder – Allegro puts more thought into the brush head (the “little thing”) than many brands put into their entire toothbrush. Because Allegro knows that the brush head is the part that actually touches your teeth – and it deserves to be treated with care.