Questions tagged [teeth]

Hard projections in the mouths of vertebrates used mainly to mechanically digest food. Teeth can also be used for the purposes of defense or obtaining meals, especially in the case of hunting.

Filter by
Sorted by
Tagged with
36
votes
3answers
2k views

Why don't teeth glow?

Hydroxyapatite is the main component of tooth enamel. It contains phosphorus in the form of phosphates, pyrophosphates etc. that are found to exhibit the the property of phosphorescence. But why don't ...
22
votes
3answers
359 views

I found this strange tooth in Galveston, Texas. What does it belong to?

I found this on May 7, 2017, on Bolivar Peninsula in Galveston, Texas. What's not visible are the treelike rings inside the tooth and what looks like a tiny interior porous center. It looks like it ...
19
votes
5answers
12k views

What is the evolutionary reason behind the fragility of teeth?

Almost all organs in the human body have a rather large threshold within which the organ or tissue is capable of repairing itself using materials supplied by the body, whether it's made from organic ...
12
votes
3answers
13k views

How is the fluoride in toothpaste absorbed?

How is the fluoride in toothpaste absorbed by our body? Does the tooth absorb the molecule directly, or is it absorbed by the mouth? The answers to this question suggest that some materials can be ...
10
votes
2answers
16k views

Why does it hurt when you take sweets, if you have cavities in your teeth?

When you have cavities in your teeth taking any sweetend drinks or food causes sensitivity or pain. What could be the reason?
10
votes
2answers
2k views

Do teeth have the capacity to heal?

Could a cavity in a human tooth "heal over" or possibly fill back in?
9
votes
2answers
325 views

Why do animal teeth get darker if exposed?

I was wondering why the teeth of cats (And dogs, as far as I know, plus possibly some other animals or even humans) get darker if they are exposed to air / light? Example: (See the lower end of the ...
8
votes
1answer
3k views

Is there any scientific evidence that a human has ever grown a third set of teeth?

This is about the possibility (or lack thereof) for a person to re-grow a new "permanent tooth" or set of teeth, to replace the teeth that grew after their milk teeth fell out. I had earlier seen ...
8
votes
1answer
937 views

How does fluoride prevent tooth decay?

Fluoride is a common active ingredient in tooth paste to prevent dental caries. It is also added or removed from the water supply in some communities for the same reason, but in children only. My ...
7
votes
1answer
466 views

Is plaque formed even if you do not eat anything?

Some people report that their gum and dental health improves when they are fasting. Many forums contain crazy amounts of misinformation and claims which are unsupported by serious scientific research, ...
6
votes
2answers
93k views

What happens to the holes in the skull where teeth were developing?

In Skeptics.SE, a question regarding the skulls of children arose. Depicting a scary skull where the permenent teeth are "hidden" inside the jaws and the milk teeth are in the their place. After all ...
5
votes
1answer
86 views

What limits our ability to grow enamel rods?

From what I've understood from what I've read (which might be wrong), enamel rods extend away from the dentin in our teeth. As young people grow, the rods are thickened. What are the technical ...
5
votes
1answer
106 views

How can fresh cavities form at the margins of sliver amalgam fillings on teeth?

Silver amalgam fillings predominantly contain silver a known bactericidal agent and mercury which a known toxin and has bactericidal property. So how is it that the plaque bacteria survive near the ...
5
votes
2answers
8k views

Why can't we grow more teeth?

A similar question but about teeth healing themselves is Do teeth have the capacity to heal?. So I understand that teeth have the capacity to heal themselves to a certain degree. It appears to be ...
4
votes
3answers
438 views

Why do bacteria eat enamel?

What causes tooth decay bacteria or acids? I've been told that it is a combination of both but why would bacteria eat enamel? There are much easier supplies of protein for bacteria to munch through (...
4
votes
1answer
190 views

What is an explanation of the dual role of calcium hydroxide in teeth?

Calcium hydroxide induces dentine formation in permanent teeth, while it causes resorption of tooth in deciduous teeth. How is this dual role explained?
4
votes
0answers
111 views

Is Fluoride really that good for tooth enamel? [closed]

Recently, I started to pay more attention to my teeth because of the high number of tooth decays, and I'm trying to understand different concepts and biological functions of the teeth and bone. By ...
3
votes
1answer
728 views

Why we have just 2 teeth cycles, primary and secondary not more?

After baby teeth go, secondary teeth grow, is there a scientific reason why they are just 2 sets not more?
3
votes
1answer
70 views

Does eating hard food really cause wisdom teeth to erupt properly?

According to the article Bad molars? The origins of wisdom teeth, in our evolutionary history, people were eating harder food like nuts and had unimpacted wisdom teeth. Later, that article appears to ...
3
votes
0answers
59 views

Why do teeth ache after fillings?

I had a filling which involved drilling the tooth, but the drilling did not touch the nerve. According to the x-ray taken at the same time, the nerve is in fact some distance from where the filling ...
2
votes
1answer
73 views

What are the teeth of the viperfish composed of?

One of the viperfish's (genus Chauliodus) most unique traits is the transparent, needle-like teeth. Some other abyssopelagic fish (e.g. certain angler fish) have similar teeth. I'm curious as to what ...
2
votes
1answer
83 views

What is it called when an animal only has one type/variation of dentition?

An example would be alligators that only have one type/shape of tooth. Not the variation in function and shape like seen in humans, which have canines, molars, incisors, etc
2
votes
0answers
54 views

Small mammal identification

Small skull found in Alberta, Canada. Do not know the region. Skull is about 17 mm in length. Trying to identify the species, narrowed it down to most like a species of vole but can't figure out which ...
2
votes
0answers
26 views

Are humans the only species to suffer from impacted teeth?

Many humans need their third molars (wisdom teeth) removed due to tooth impaction. Are humans the only species to suffer from this?
1
vote
3answers
3k views

Why do we have nerves in our teeth?

Toothache is a useful signal to us as we can visit the dentist who can try to fix any problems with our teeth. But what is the natural biological role of toothache? Does toothache make animals take ...
1
vote
1answer
116 views

How many teeth can “African wild dogs” have?

The New York Times article In Mozambique, a Living Laboratory for Nature’s Renewal discusses reintroduction of what the article calls only "African wild dogs" into Gorongosa National Park in ...
1
vote
1answer
91 views

If animals aren't getting tooth decay because they don't eat processed foods, could similar work for humans?

In previous question here on stackexchange biology I read that animals don't get dental caries because they aren't exposed to refined carbohydrates like sugars. My question is: in theory, could a ...
1
vote
1answer
2k views

Does xylitol kill all kinds of bacteria?

Xylitol is known as a bad bacteria killer in human's mouth. But I am curious about one thing. Does xylitol kill all kinds of bacteria regardless of good or bad? If so, Does xylitol kill bad bacteria ...
1
vote
1answer
538 views

Why do humans have irregular teeth and impacting wisdom teeth?

Imagine that horses, dogs, bears, and gorillas had teeth as unreliable as humans do, The interruption in behaviour and stress brought by teeth would cause them to be more prone to sinus infections, ...
1
vote
1answer
2k views

Why do rodents' teeth continue to grow?

Why do rodents' teeth continue to grow? Enamel formation and/or root formation continue throughout rodents' lives. What's the mechanism that causes this?
1
vote
1answer
69 views

Have Polyphyodonts ever evolved from Diphyodonts?

The Wikipedia article for polyphyodont says this: Although most extant mammals are not polyphyodont, mammalian ancestors were. During the evolution of Therapsida, there was a period during which ...
1
vote
1answer
130 views

Detecting Calcified stones and cracks in tooth

I had a dental problem when my first molar broke some months ago and after some decay and pain I am undergoing a dental treatment. The doctor was performing a root canal and kept on talking about ...
0
votes
0answers
18 views

What causes the unpleasant feeling when brushing teeth after eating something sour [on hold]

I have noticed a strange unpleasant feeling when I brush my teeth if I have eaten something very sour the same day. It only happens when touching the teeth near the area where the thing was chewed. I ...
0
votes
0answers
40 views

Carbohydrate diet and dental health

I read that human started carbohydrates rich diet after adopting agriculture before that meat was main energy source which has comparatively less carbohydrate. High carbohydrate started destroying ...
0
votes
0answers
54 views

Why are deciduous teeth shed? [duplicate]

Why do we have two sets of teeth? Why do earlier shed and new teeth replace them? In humans, kids do not have any need for replacement of the teeth. Why don't the milk teeth grow themselves? Or why ...
-1
votes
1answer
1k views

After doing brush I feel hungry? [closed]

Why I feel hungry after brushing my teeth in morning? I usually have my dinner in between 9 to 10 at night and then I sleep at 12. Sometimes I wake up at 6 in morning and then I go to brush my teeth. ...