No. Denture toothpastes are more abrasive that those meant for natural teeth.
Not really. A little more abrasive than regular tooth paste.
Test. No. They are usually more gritty. Take some regular toothpaste and rub it between your fingers, now do that with the denture paste and notice the difference. Please use only regular tp on your teeth.
Not recommended. Denture toothpaste may not have Fluoride in it. While it probably wouldn't be unsafe it would probably be unwise. Stick to regular toothpaste for teeth.