Why does a stray piece of tin foil against your filling make you feel like your head will explode??
Question: It makes me cringe just thinking about it. Same with cotton wool balls.
Answers: the alloy in your filling is like an electrode. the saliva is a weak electrolyte. When you get aluminium foil in your mouth, it is like a second electrode and - voila - you have a battery.
that wouldn't be so bad, but one of the electrodes (the filling) is right on your nerve ending.
hence, pain
:-)
I don't know but it sure does!
yea - that is bad. worse than nail on a chalkboard - even thinking about anything with my teeth gives me chills - ugh... teeth
Why are you eating foil??
yeah im with you on the this! i HATE cotton wool between my teeth, but i have this self destructive button that when i see a woolly jumper i have to squeak it between my teeth just to remind myself how horrible a sensation it is. am grimacing right now thinking of it!
i've noticed no one has actually answered your question yet lol...
i dont know either mate lol....f*ck me ....it does hurt tho
Doesn't hurt me... oh, wait, my teeth are all coated with silver... too bad they don't put that kind of detail on Avatars!!!
It creates a small electrical charge between filling and foil
It's called Galvanic Shock.
The standard dental filling is an alloy of silver, tin and mercury. When a piece of aluminum foil is placed in the mouth, a wet cell battery is formed. The tooth filling is an electrode and the aluminum foil is the other electrode and the saliva, the electrolyte. The sharp pain comes when the mouth battery is short circuited by touching the aluminum electrode to the dental amalgam electrode. The current quickly stops, so the pain is brief.
I'm a dentist.
It's a process called galvanization , if memory serves.
For some reason I cannot remember specifically, there is an electric potential between the amalgam in your tooth and the foil that comes into contact with it. I would surmise that it works very much the same way a galvanic cell does: two different metals....one serving as the anode and the other as a cathode...with your saliva functioning as the medium.
Thus, when you bite on foil, charge travels.
Harking back to high-school physics:
Charge = coulombs
Current = coulombs / second
Voltage (electric potential) = IR = current x resistance
Basically, where you have a voltage and a closed circuit, you're going to have current.
Thus, as I understand it, you're shocking your tooth by biting on foil.
Answers: the alloy in your filling is like an electrode. the saliva is a weak electrolyte. When you get aluminium foil in your mouth, it is like a second electrode and - voila - you have a battery.
that wouldn't be so bad, but one of the electrodes (the filling) is right on your nerve ending.
hence, pain
:-)
I don't know but it sure does!
yea - that is bad. worse than nail on a chalkboard - even thinking about anything with my teeth gives me chills - ugh... teeth
Why are you eating foil??
yeah im with you on the this! i HATE cotton wool between my teeth, but i have this self destructive button that when i see a woolly jumper i have to squeak it between my teeth just to remind myself how horrible a sensation it is. am grimacing right now thinking of it!
i've noticed no one has actually answered your question yet lol...
i dont know either mate lol....f*ck me ....it does hurt tho
Doesn't hurt me... oh, wait, my teeth are all coated with silver... too bad they don't put that kind of detail on Avatars!!!
It creates a small electrical charge between filling and foil
It's called Galvanic Shock.
The standard dental filling is an alloy of silver, tin and mercury. When a piece of aluminum foil is placed in the mouth, a wet cell battery is formed. The tooth filling is an electrode and the aluminum foil is the other electrode and the saliva, the electrolyte. The sharp pain comes when the mouth battery is short circuited by touching the aluminum electrode to the dental amalgam electrode. The current quickly stops, so the pain is brief.
I'm a dentist.
It's a process called galvanization , if memory serves.
For some reason I cannot remember specifically, there is an electric potential between the amalgam in your tooth and the foil that comes into contact with it. I would surmise that it works very much the same way a galvanic cell does: two different metals....one serving as the anode and the other as a cathode...with your saliva functioning as the medium.
Thus, when you bite on foil, charge travels.
Harking back to high-school physics:
Charge = coulombs
Current = coulombs / second
Voltage (electric potential) = IR = current x resistance
Basically, where you have a voltage and a closed circuit, you're going to have current.
Thus, as I understand it, you're shocking your tooth by biting on foil.
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