It depends were you want to do this. If you are talking in the corners of the bathroom, round the tub, or where the counter and back splash meet, then yes. But, if you would like to do this in all the grout lines, no.
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The obvious answer is sanded grout has sand. But the in depth answer has many differences. Sanded grout which is the most common, can be used in a grout joint from 1/8" to 1/2" (and larger but check the grout). Sanded grout scratches many tile like glass. Non sanded grout can only be used on joints 1/8" or less. Non sanded grout is typically seen on marble and granite tile, many wall tile, and all glass tile.
Grout is not toxic. Grout sealers and adhesives can be toxic but not the grout itself. Tami Barker www.mosaicforms.com Mosaic Art Instructor and Creator
Yes, you can change the color of the grout. There are products that you can use to try to die the grout or you can just have your tile re-grouted.
hardwood or vinyl . tile on a raised foundation will always crack in the grout lines
Yes. But you would want to make sure it's immaculately clean first. Possibly etch with a slightly acidic grout cleaner. Follow instructions on grout sealer container.