QUESTIONHow do i get the shine back on a glazed tile floor?
ANSWERANSWER - If it is a true glazed ceramic tile then the surface is a fired on glass-like material. If it originally had a sheen to it and is no longer there then it must have worn off or someone used an acidic solution that etched the tile surface. There is nothing you can do to restore that finish. Although you might be able to apply a wax or a surface sealer of some sort to give it a shine, but it will wear off and require regular maintenance to maintain it.
If you have an unglazed tile with a sealer on it that has worn off, then you can reseal it. You may need to strip the old sealer off before you apply the new sealer.
If you have a polished porcelain tile or a polished natural stone that has lost its sheen, they can be re-polished by a professional stone restoration company.