you are probably easily bruised because you might be anemic or have some other blood issues with nothing to do with vitamin c. the tendency to bruise easily is also hereditary.
obviously, if your teeth are squeaky with the vitamin c, then it is telling you that there is too much acid in the product. citrus and it's byproducts are usually acidic. this is why ppl who suck on lemons end up with dental corrosion. imagine what thats doing to the inside if you take too much of this stuff. all i'm saying is you are not doing this in moderation. moderation is the key. mega doses of any type of vitamin is not good. too much is not necessarily better, plus you are wasting money because your body is not using the excess and just excreting it in your urine.