Is it ok to bleach a 100-percent rayon shirt?
It would be best to use a non-chlorine bleach, such as oxy-clean. Chlorine bleach tends to leave a yellow tinge onrayon or polyester type fabrics.
Sure. Just soak the toothbrush in a 10% solution of bleach for 10 or 15 minutes, and then wash the brush with soap and water to get the bleach out. It is ok if you have a faint smell or taste of bleach from the brush; dilute solutions of bleach are used by some dentists as a rinse while doing dental procedures.