**Remind children when a rule is relevant, and adjust the frequency to how reliably they can use it.** There isn’t a universal “every X days” schedule.

A practical approach is:

- **When introducing a rule:** explain it briefly, say why it matters, and demonstrate what to do.
- **Before the relevant situation:** give a short reminder—for example, before entering a busy park or crossing a road.
- **While they are learning:** prompt calmly when needed and acknowledge success: “You checked with me before leaving. Thank you.”
- **Once it becomes a habit:** reduce reminders. Revisit it when circumstances change, they seem uncertain, or they make a mistake.

For safety rules that rarely come up naturally, add occasional, brief practice. Ask “What would you do if…?” and let the child demonstrate the response. Being able to recite a rule is different from being able to apply it. The National Center for Missing & Exploited Children recommends conversations and role-play for this purpose. [NCMEC guidance](https://www.missingkids.org/blog/2023/staying-away-from-stranger-danger)

For your example, I would replace **“Don’t talk to strangers”** with something more specific:

> “Before going anywhere with anyone, check with me—or the adult looking after you—and get permission, even if you know the person.”

That gives children a clear action and also covers familiar people. A blanket ban on talking to strangers can make it harder for a lost child to ask for help. Teach whom to approach, such as a store employee or a parent with children. [NCMEC safety scenarios](https://www.missingkids.org/content/dam/kidsmartz/pdfs/KidSmartz_Safety_Scenarios.pdf)

You could practice: “Someone says they have a puppy around the corner. What do you do?” Help the child rehearse saying, “I need to ask my parent first,” and returning to you. Keep it calm and predictable rather than staging a frightening surprise test.

Without seeing the video’s methods, I wouldn’t treat it as evidence for how often reminders are needed. And even a child who answers every practice question correctly still needs supervision appropriate to their age; remembering rules cannot carry the whole responsibility for safety.