It's very hard. Teenagers will teach each other to circumvent any of this within seconds. It's as old as the internet.

But maybe it would be healthier if you discuss this topic with your 12-year-old. The reality is that they'll be able to find any kind of pr0n within seconds when they has access to an unfiltered computer or phone.

At age 12 it's also expected that you start the transition from a child to an adult, so trying to block the outside world isn't preparing them for the freedom they'll encounter at 18-21.

The idea that there is even a definition of 'healthy' porn seems ludicrous to me. That's not 'really' tackling the problem. That's not understanding the problem in the first place.

Speaking of which: there isn't a problem in the first place.