Quote:
Originally Posted by CanuckRolex
Sorry, but you are asking things that are not related to the task at hand.
Are we talking about diamonds here? No... So you point is moot.
You arguing about sand paper scratching a synthetic Sapphire crystal has no comparison to a nice and extremely soft plastic bristle toothbrush scratching metal which is nonsense.
Plastic CANNOT SCRATCH METAL. Something embedded in it can, but plastic itself scratching metal? Comon now, are you seriously trying to push that opinion across?
I'd hate to see what it would be doing to your teeth. I don't think they make toothbrushes that scour your teeth and remove tooth enamel.
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My situation is entirely analogous: I am describing how a softer material can still cause scratches in a harder material. I am not sure why you keep trying to dismiss my thought experiment.
In fact, it is your situation that is not relevant: tooth enamel has a highly irregular surface that unevenly reflects light. On such a microscopically coarse surface, a few additional scratches will neither harm functionality nor appearance. This is totally different from a highly polished gold surface that will show very fine scratches quite readily. Again, we are talking about scratches that may be as little as microns deep. At best, teeth have mineralization ridges in the order of tens, if not even up to 100 microns or more.
By your logic, why not use copper wire (3 Mohs) to brush your teeth (4-5 Mohs)? Copper wire is softer, so it should not scratch your teeth, right?
My initial point was that nothing is scratchproof and that we have to consider factors (such as point stresses) OTHER THAN hardness in assessing whether scratches will form.
Regardless...your watch is your's, and my watch is mine. We can each do what we feel like as long as it doesn't harm anyone else.
SNB