The colors indicate the grit or abrasiveness of the bit. Yellow stands for extra fine, red for fine, blue for medium, green for coarse, and black for extra coarse. This allows you to quickly see which bit is suitable for which application.

For beginners, a red (fine) or blue (medium) bit is ideal. These are gentle enough for controlled work, yet still offer good material removal rates. With them, you can practice safely and gain experience.

No, coarse bits (green or black) are far too harsh for natural nails. They should only be used for artificial nails (gel or acrylic). For natural nails, it's best to use yellow or red bits.

After every customer! Hygiene is extremely important. Clean the bits with a brush, then disinfect them with a suitable disinfectant or in an ultrasonic cleaner. This will prevent germs and extend the lifespan of your bits.

If you notice that the bit is no longer cutting properly, looks dull, or requires more pressure than usual, it's time for a new one. You should also replace it immediately if it shows visible damage or rust.

Yes, there are extra-fine bits, usually with a yellow or red ring, that are specifically designed for cuticle work. They are smaller, more precise, and particularly gentle – perfect for fine-tuning around the nail bed.