The battery powered, double-headed, sonic toothbrush is probably the best pet toothbrush in the world. The brush has 20,000 bristle movements per minute and is highly effective at removing plaque. The package contains a holder with 2 brush heads; one in size S/M (white) and the other in size L (grey). The Silent Power is delivered without a battery, as we have experienced leaking batteries in cases where the product have been stored under hot conditions or in certain cases when shipping with airfreight. Replacement heads available: The Petosan replacement heads are designed for the twin-head dental brush, cleaning the inside and outside surfaces at the same time at the recommended 45-degree angle. Targets the vulnerable area between teeth and gum line in one easy operation. Saves time and pets accept treatment easily increasing client compliance. Contains high-quality dupont tine nylon filaments with the appropriate softness required for pets. Designed to fit the Silent Power-Sonic