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Why are my teeth sensitive after replacement of silver fillings?

Issue
I had my silver fillings replaced 2 weeks ago and are so sensitive, i was wondering how would a dentist fix this.

Best Tip

This is a risk you take when placing white fillings (composite).
Silver fillings are easy to place, they are not sensitive to wet conditions, have no shrinkage upon setting, and any microscopic gaps at the edges of the filling quickly develop corrosion products that are self-sealing. They are almost foolproof... but they're not attractive.
White fillings are very sensitive to moisture contamination. They rely upon an adhesive to make them stick to the cavity walls, and any contamination will break that bond, allowing bacteria to get in. Also, as white fillings harden under the light, they will shrink towards the centre of the tooth, thus tending to pull away from the adhesive and breaking it. White fillings should be placed in small bits at a time, and hardened with the blue light. If done in a single big lump, then failure will occur. White fillings in thin sections are more flexible than silver fillings, and flexion causes leakage. Leakage causes pain and eventually decay.
Having said all that, white fillings can work very well if placed properly in the right situations. But because of the risks, it is not suggested that you replace silver fillings with white fillings just because of the colour. Do it if the silver filling or tooth has broken or failed for other reasons.
My first suggestion is to talk to the dentist about your problem. Anything that lasts for more than a week is of concern, particularly if the pain is increasing.
Secondly, redoing the white filling carefully will sometimes resolve the problem.
Thirdly, sometimes you have to go back to silver fillings.
(Depending upon the actual material, the antisensitivity stuff mentioned by Melodyanne1 above can sometimes help in the immediate post-op period, but many of these substances will interfere with the adhesive in the long-term. I don't believe they should be necessary or that they should be used.)

Others
when i had my filings replaced the dentist put a layer of like antisensitivity stuff inbetween the tooth and the filing. I think you have to ask for it cause it was like 50 bucks extra. But next time get it, believe me it helps.
plus if the dentist had to drill further you might have had some nerve showing where he put the filing over and that would cause it to be sensitive. Go back to the dentist and let them know. He should fix it for you.
Tooth sensitivity following placement of a filling is fairly common. A tooth may be sensitive to pressure, air, sweet foods, or temperature. Usually, the sensitivity resolves on its own within a few weeks. During this time, avoid those things that are causing the sensitivity. Pain relievers are generally not required.

Contact your dentist if the sensitivity does not subside within 2 to 4 weeks or if your tooth is extremely sensitive. He or she may recommend you use a desensitizing toothpaste, may apply a desensitizing agent to the tooth, or possibly suggest a root canal procedure.

Pain around the fillings can also occur. If you experience pain when you bite, the filling is interfering with your bite. You will need to return to your dentist and have the filling reshaped. If you experience pain when your teeth touch, the pain The pain is likely caused by the touching of two different metal surfaces (for example, the silver amalgam in a newly filled tooth and a gold crown on another tooth with which it touches). This pain should resolve on its own within a short period of time.

If the decay was very deep to the pulp of the tooth, you may experience a "toothache-type" pain. This "toothache" response may indicate this tissue is no longer healthy. If this is the case, "root canal" treatment will be required.

Sometimes people experience what is known as referred pain -- pain or sensitivity in other teeth besides the one that received the filling. With this particular pain, there is likely nothing wrong with your teeth. The filled tooth is simply passing along "pain signals" it's receiving to other teeth. This pain should decrease on its own over 1 to 2 weeks.