Replacement of brush head: 8 brush heads are included in the set, so you don't need to repurchase the head frequently. Please note: Confirm if the airtight pouch of the brush head is open before using it. Each of our brush heads is individually sealed to ensure that it will not be re-sold. However, the bristles may be deformed during transportation. You don't need to worry about it, just soak it in warm water above 50 degrees for 15 seconds, then it will return to the original shape. Battery life of C2PRO. It can work for 56 days after being fully charged. It supports quick charging, so you don't need to charge it frequently. Besides, there is a travel case inside the set. You can take it with you when you are on a travel, which is very convenient. Modes: It supports 4 different modes, clean, whiten, soft, and super. You can choose different modes according to your preference. Each mode vibrates differently in forces and ways. Each light represents a mode, when the lights of the modes of clean, whiten, soften keep flashing, it refers to the super mode. ?CONTACT kingheroes?Login your account > choose "Your orders" > find the order ID > click "Contact seller".Kingeroes will provide you with after-sales service 7 * 24 hours. Kingeroes C2PRO electric toothbrush. It adopts the latest sonic vibration technology. The metal shaft generates the vibration force. The vibration frequency can reach up to 42,000 times per minute. It can effectively remove plaque, whiten teeth and improve oral health. The vibration it produces is like the sound of a sports car rather than the tractor-like sound of the normal plastic shaft.