I was taught to stand with your back to your house n throw it up the roof.
I never gotten the logic behind it but all of my teeth went the same way.
I think the logic is to lose that tooth and if you find it again, it's bad luck.
Your tooth is a part of yourself. If you can pull a kidney and discard it, can you? You only need one to live but we are attached to out parts till death do us part. I'll just lose my tooth on purpose and hoping u will never see it again.
Not sure if it is a Viet tradition or just a family one but I will honor the fake news to my kids instead of the tooth fairy American tradition stuff.