Okay, so probably your cat doesn’t use your toothbrush when you’re not looking. Probably. But even so, toothbrushes get gross fast. I love my Sonicare, but even when you cover it up with its little plastic cover it gets icky (although at least then the cat can’t get it!).
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My solution: Denture tabs! Just drop 1-2 in a glass of water (or follow the instructions on the box for dentures) and pop in your toothbrush. Voila. Clean bristles without purchasing one of those UV lights. Cheap and easy and it really disinfects your brush.
Sine
You can also put your toothbrushes in the dishwasher when you do a load of dishes.