I have a granite table, I've had it for 25 years 2 of my boys plus friends 5 dogs who have tried to teeth on it and not a mark, never had to have it sealed or polished. I was told when I had it made that granite will never mark, will outlive me after all it's what headstones in a graveyard are made of. I wanted marble, but was advised granite was better as marble is porous, marks and needs sealed frequently.