Less radically and more accessibly, adding a bitter ingredient seems to work (n = 1). Caffeine powder is cheap and bitter, but there are probably better options.
Umm.....… but caffeine is also addictive. This seems like a flaw in the plan.
there are probably better options
I have heard of bitter nail polish for people who want to stop biting their nails.
Less radically and more accessibly, adding a bitter ingredient seems to work (n = 1). Caffeine powder is cheap and bitter, but there are probably better options.
Umm.....… but caffeine is also addictive. This seems like a flaw in the plan.
I have heard of bitter nail polish for people who want to stop biting their nails.