Delivery was fast and flawless. The quality of toothbrushes is absolutely top. We use about 2.5 to 3 months, and you still see absolutely out fine. Due to the gentle movements of both gums, teeth, and the brush can be positively influenced. Since we with these brushes and brushes course the associated drive our dentist is also very happy and he did not know that we changed (manually on Ultrasonic). So you can also delay the one or other oral hygiene something and improve the overall condition of the teeth. In a business case this care method gets out definitely a winner. In total, the annual costs are lower than with a conventional manual toothbrush. Only honest fun therefore no longer makes me brushing also ;-)