I have really thick and strong black head-hair, it is a lot of hair and it grows really fast. It changes a lot while it grows, if it's 1cm long, more or less, it's straight but soft, then it gets a bit rougher and starts to get wavy and finally after it grows over 4cm it gets labrador-like rough unless I wash it regularly and starts to curl while it's still enough strong to grow in all directions.... except downwards :/
One of my molars has 5 tips instead of 4. It doesn't generate any problems and, in fact, it matches perfectly with the upper molars. Anyway, most of my teeth are bigger than average per-se and my jaws can acomodate them all, so a molar with 5 tips isn't big enough to cause any trouble. The benefit of having big bones.
Several years ago, when I was 11 or so, I had otitis (an infection in my ears) due to swimming too much, though I believe its cause was specifically swimming in thermal water (hot springs).
So, after it I found out that my ears and the mouth/nose cavities where a lot more interconnected than before, I can move som internal muscles that act over the ears' cavities qhich makes my hearing become "deeper", also when I do that I can hear some internal sounds from my mouth and nose, eg: when I breathe it sound like when the wind hits a microphone or when an animal snorts or something like that. Luckily this doesn't compromise my hearing for the normal frequence range or the volume at which I hear everything, in fact my hearing is quite good. Which is nice since I'm a Sound Director/Editor for audiovisual projects
Finally, my skin cicatrizes fast, which is good, but it tends to over-cicatrize if it has to repair a portion more than a couple milimiters wide, so I've ended with some not very nice-looking scars on the back of my left hand, both my knees and my left foot.