It is hygienic enough. Each brush head has a different mark, easy to distinguish.
12 Pack Replacement Toothbrush Heads Compatible with Philips Sonicare Toothbrush
Replacement Toothbrush Heads Compatible with Philips Sonicare Brush 8 PK
Replacement Toothbrush Heads Compatible with Philips Sonicare Brush 8
Replacement Toothbrush Heads Compatible with Philips Sonicare and More 8 Pack
12 PCS Replacement Toothbrush Heads, Compatible with Philips Sonicare Toothbrush
