Cedar blocks do not expire, but they may lose their potency over time. They are typically used as a natural moth repellent in closets and drawers and will continue to do so as long as their scent is present. If the scent starts to fade, you can gently sand the blocks to release more of the natural oils and restore their effectiveness.
Eventually, over time, the fragrance that comes from the cedar wood will become less. The oils and other moth-repelling substances will vaporize. Lightly sanding the wood may help to reactivate the cedar odor--but you would have to have real cedar wood for this to work.
cedar
I'm a little confused by this question. Is the idea to preserve the teddy bear? In that case I would recommend anything with cedar in it. You wouldn't have to get an entire cedar box, but most places that sell closet accessories sell cedar shavings or cedar blocks that you can pack with your bear. This prevents insect infestations like moths.
You can store wool with materials that repel moths. Options include cedar and moth balls.
Yes, rosemary [Rosmarinus officinalis] is effective against insects. The herb or its oil particularly are respected as controls of mosquitoes [Culicidae family]. In that regard, they're as effective as is cedar [Cedrusspp] wood oil against moths [Lepidoptera order].
killing moths
Cedar closets can provide a nice, pleasant aroma when opening. And also the woods natural properties helps keep out moths as well as absorb moisture and odors.
bugs don't like cedar, in old homes the closets are lined with cedar to keep moths from eating holes in there clothing.
Using cedar when constructing a closet can help with keeping out pests such as moths, roaches, and rats. They leave an intoxicating cedar aroma and are found often in older model homes.
To effectively protect your clothes from pantry moths, store your clothes in airtight containers or garment bags, regularly clean and vacuum your closet, and use moth repellents such as cedar blocks or lavender sachets. Additionally, inspect and wash any second-hand clothing before storing them to prevent infestations.
To prevent clothes moths from damaging your wardrobe, you can regularly clean and vacuum your closet, store clothes in airtight containers, use moth repellents like cedar or lavender, and regularly inspect your clothes for signs of moth damage. Unfortunately, I do not have pictures of clothes moths to share.