How we can prevent kids from toy dander

Well, here I go again, guessing at what you mean. I know plenty of people on this site do not speak English like a native, so I give it the old college try.

Dander is the stuff that comes off your head when you have dandruff. Since toys normally are not alive and cannot shed dander, I think you meant danger. In that context, the term "prevent" is not used correctly, but I get the idea.

The best way to prevent toys from being a danger to your child is to always choose age-appropriate toys. Now, the American toy industry makes a great big deal out of marking packages with the appropriate age for children, but when I was a kid, my parents and I agreed that these age markings were hopelessly childish. If they said "ages 5 to 8," for example, we knew it was already too limited for me by the time I got to five. I mean, Candyland was labeled as if kids didn't learn to read until they were like 6 or 7!

So a rule of thumb is this: Before two, don't buy anything they can't put in their mouths, nor anything that can come apart, where a piece small enough to swallow would be the result. No very sharp edges until they have demonstrated an ability to handle things properly and not cut themselves.

As to breaking toys, and the jagged edges of a broken piece, I would not give anything brittle enough to break like that to a child below four or five, until they learn not to smash and break things, even in a temper.

Basically, if you can imagine the child taking the toy to bed with him or her and not being injured by rolling over on it, then it's OK for a kid under 5.

After that, the only things that need to be monitored more carefully are chemicals like paints or chemistry sets, and things which have sharp edges. Children must be taught how to use knives and things, as appropriate, but you don't leave them alone with them until they are past the "clowning around" stage of development. For some kids, that's a loooonnnng time coming: maybe 20 or 30 years!