A lace front wig is reusable. The lace is delicate, but the wig itself is not meant to be thrown away after one wear. How many times you can reuse it depends on the hair quality, lace condition, adhesive method, removal habits, washing routine, and how aggressively you style it.
There are two kinds of reuse. The first is wearing the same wig many times without fully reinstalling it every day, using straps, combs, clips, or a glueless method. The second is removing adhesive, cleaning the lace, washing the wig, and reinstalling it later. Both are normal.
The second type is where people ruin wigs. Lace tears when adhesive is ripped off. Hair sheds when the lace is scrubbed hard. The hairline gets patchy when people over-pluck or keep pulling glue residue from the same area.

A good human hair lace front can last months or longer with careful care. A cheap synthetic lace front may still be reusable, but the fibers may tangle, frizz, or lose shape faster. Cosplay lace fronts can last for years if they are worn occasionally and stored well.
The lace usually fails before the idea of reuse does. Once the lace is torn, stretched, badly stained, or missing too much hair at the front, the wig becomes harder to reinstall naturally.

Never peel lace off dry glue. Use an adhesive remover designed for wig glue or tape, let it sit, and lift slowly. If the lace resists, add more remover and wait. The goal is to dissolve the bond, not win a tug-of-war with your hairline.
Remove glue residue from the lace gently. Wash the hair only when needed, not after every short wear. Detangle from the ends upward. Let the wig air dry on a stand. Store it with the lace protected so it does not fold, snag, or collect lint.
Retire or repair the wig when the lace is ripped, the hairline is too thin, shedding is obvious, the cap is stretched out, or the fiber no longer responds to conditioning or styling. Sometimes a stylist can replace lace, add hair, or turn a lace front into a behind-the-hairline wig, but not every wig is worth repairing.
Bottom line: yes, you can reuse a lace front wig. The secret is patient removal, gentle lace cleaning, and not over-styling the same fragile hairline every time.