This thread makes me feel like this is the mouth equivalent of "cleanses" and those, while allegedly making people "feel great" and "feel like I lost 10lbs!" are not healthy things to do regularly. I have a hunch that you might be potentially causing other health issues by scraping your tongue with any regularity and I doubt this actually does jack shit about bad breath like you people seem to think (quick google seems to support that there's no real scientific evidence that it does - and generally people that are scraping their tongues likely also doing other healthy habits like brushing and going to the dentist regularly and the people with bad breath probably are not doing that stuff so blaming it on lack of tongue scraping isn't really valid; to be fair it doesn't seem to indicate its harmful either, but I'm guessing a lot of what you're scraping off is actually just phlegm and mucus which is actually part of your body's natural way of dealing with bacteria by trapping it in such where it can then be sloughed off and probably dissolved in your stomach acid).
And just because you get stuff on it doesn't mean that stuff is actually bad, so it kinda reminds me of those "toxin" things where people put some tape on the bottom of their feet and then are shocked when they pull them off and its covered with crap. That doesn't mean you're actually removing anything unhealthy. And let's not forget ear candles. Likewise, the "coconut oil rinses" that are probably no more effective than rinsing with just plain water.
Which, that's the best thing to do with regards to bad breath, rinse your mouth out well with water after you eat (and pick out any big food particles). No, not mouthwash (and definitely not alcohol based ones). You should be brushing before you eat as well (not just before, like an hour or so at least), as the point of brushing is actually to leave residue behind that fills in the little nooks and crannies on your teeth (to prevent bacteria from taking up there instead). Mouth washes could also be a source of the bad breath, as, it'll dry out your mouth which helps bacterial growth, so if you're doing that more than a couple of times a day you might actually be making things worse. So rinse with water after, and in general make sure you drink water somewhat regularly. Which, saliva actually deals with bacteria some on its own.
Which the link between mouth health and hearth health is probably because poor diet is the source of both, and not really due to poor oral health habits (besides it being correlated and just a general sign of laziness and/or ignorance). Eating sugary foods and starches is what fuels the bad bacteria (that cause bad breath) in your mouth, and that's also a major contributor to other health problems like diabetes and heart disease.
I had to laugh at the linked tongue scraper where they claim that people use steel for utensils because its "more gentle" than plastic. JHumeC...
As WaTaGuMp said, tonsil stones are also a culprit for bad breath.
Eat more fresh fruits and vegetables too.
Er, fruits could actually be a contributor to bad breath as the sugars are food for the bacteria that causes bad breath and gingivitis. Granted, that's better than processed sugary stuff (and way better than stuff like soft drinks) and fruit is good. So just remember to rinse your mouth out well after. Also, there's an awful lot of people that seem to be unable to eat fruit without dipping it in sugar or have it chocolate coated, so don't assume recommending fruits and veggies is healthy. Likewise, some people can only eat veggies when its drowned in ranch dressing or fried or cooked other ways that will largely if not completely nullify the health benefits.