I don't think it's very plausible for shampoo but it's relevant for toothpaste for sensitive teeth. There's are two mechanisms for sensitive teeth, one is to fl

I don't think it's very plausible for shampoo but it's relevant for toothpaste for sensitive teeth. There's are two mechanisms for sensitive teeth, one is to flood the nerve with potassium ions using potassium nitrate, i.e. saltpetre. The other method is to block access to the nerve endings with other chemicals. You could potentially mix toothpaste and get your mouth to warm up slightly.