When you're a kid, you start to lose your milk-teeth. One by one, they get looser and looser and eventually fall out; mostly because you're almost guaranteed to be playing with them, prodding with your tongue, and so on. It's a totally natural and normal thing, and most people are aware that you generally should never pull a child's tooth out for them.
So what the hell is the deal with the number of American parents (I know only of American parents that do this) performing elaborate tricks such as using a water-pressure rocket, a dog, a door handle, or pushing their big adult hands into their son or daughter's face to pull them out? Often it involves a very clear breach of trust and force, and I've seen parents stick these god damn videos on YouTube.
"Look how good a parent I am! I distracted, misled and lied to my distraught kid, then pulled their tooth out using a bull-terrier, a stick of dynamite and a length of string! That's not dangerous at all!"
This is just one of those bizarre things I think American parents used to do and then pass on without thinking - like mutilating the tip of their baby boy's penis to satisfy a religious panic they don't even know about anymore (note: no, it's not done for health reasons, no paediatric body on Earth would say you should circumcise boys by default for "health reasons"; the reason it is so popular in the USA is that it was the USA that was gripped by Puritan religious anti-masturbation panic some decades ago. Period. If you had a good reason for it, the rest of the world would be doing it too, stop defending the practice.).
Seriously though, don't pull your kid's teeth out when they get loose without a damn good reason - such as ulceration/infection. There is ZERO reason for it; the reason they're apprehensive and ask you to leave them alone (as you should - respect their bodies) is because only the tooth's owner knows how loose it is, and pulling a tooth out violently when it isn't ready - and remember, the kid will poke and prod it out of their mouth by themselves and it will come loose when it's ready, so you needn't do anything - can cause damage to the gums, bleeding, infection, damage to roots and misaligned adult teeth. They can totally swallow it, it doesn't matter. Leave it alone.
I don't get why people feel the need to do this. Leave the f*cking tooth alone... and definitely stop putting these videos on YouTube for those mongoloid retards to insist you're a good parent somehow because they glorify being deceitful or borderline violent with a small child.
Also, on a creepier but related note... I've seen parents insist you should manually stretch your child's foreskin to prevent certain very rare medical conditions. What the HELL? First off, dude, you... stop that. That is just creepy. Secondly, forcing the foreskin at a young age can cause scarring on the penis. Do you really want to do that to your kid? No paediatrician advises this today. The kid will do it himself, by... ding-ding-ding! Playing with it! Just like with the tooth! As with circumcision, you won't need to worry about most of these issues if you don't make your kid terrified of touching himself.* It'll remain clean, the foreskin will detach as normal at a young age, and no conditions will arise... because your kid will be... ding-ding-ding! Playing with it! Leave it alone; and don't make your kid a repressed ball of shame. No harm comes of it.
God, seriously. The bizarre shit idiots post on "medical" forums.
On a slightly different note, this is one thing many authors forget. Your characters will be losing teeth up until about the age of thirteen or so. So, say, Nick from Astray will still be losing his. Heh!
I actually used to panic about it, as a kid. I wonder if I was the only one? Teeth coming loose when I was 13 would cause me to totally freak out. Always thinking I was too old for it, but actually it wasn't unusual. Kids panic about the stupidest shit... My front teeth used to be really prominent, and they felt loose, so I used to totally freak about that.
It's amazing, the stuff that you worried about as an adolescent. People who claim kids "never worry about anything" or "think they are invincible" are absolutely forgetting how it used to be for them.
* -- seriously, watch this. Watch aaaaall the Bullshit.