ANGLED HEADS: with 2 angled heads, it's better to fit your dog's mouth. DOUBLE END: when cleaning different sized teeth within your dog's mouth, it would be efficient to use double ended toothbrush. SOFT BRISTLES: with soft bristles, it would hardly cause scratched enamel and sore, bleeding gums. EASY USE: with 8.5' long handle and a double end, it's much easier to reach right to the back and get into all nooks and crannies. MULTI PACK: 6 double ended toothbrushes and 4 finger ones will always keep you having a doggy toothbrush handy.