Do you have peroxide?
No - Put it on your list and buy some
Yes - Is it open?
No - should be fine if it isn't too old
Yes - if it's been open more than ~12 months, you might want to replace it for a fresh bottle
I usually have a bottle on hand in case I need it for the dogs. Movers didn't pack liquids and I had forgotten to buy any as of yet. I remembered this when I had a dog foaming at the mouth tonight and had to quickly figure out if said dog needed to be forced to puke up a lizard, go to the vet or something else (c- something else, rinse mouth out with water to remove lizard toxin).
So, check your peroxide. If you don't have any to check, get some