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Healthy parts of your tooth must often be removed to make a space large enough to hold an amalgam filling.
Amalgam fillings can corrode over time, causing discoloration where the filling meets the tooth.
A traditional (non-bonded) amalgam filling does not bond to the tooth. It just sits in a pocket created by your dentist.
Some people may be allergic to mercury or be concerned about its effects, although research shows the amount of mercury exposure from fillings is comparable to what people get from other sources in the environment.
Fillings which require the dentist to remove excessive amounts of good tooth structure are not cheap. Which is best?.
Since the mid-80's a new system , called indirect composites combines the best of the composite and the strength of a natural tooth. This inlay process is much easier on the patient (and dentist) and has virtually eliminated the two major drawbacks to the composite restoration. Lab processed composites and porcelain fillings appear to have solved both the wear and placement problems.
First in every concerned doctor's mind is the protection of the patient from additional exposure to mercury. This is especially true of the mercury toxic patient. The mercury toxic patient may have been exposed to varying amounts of mercury from diet, environment, employment or from mercury/silver dental fillings. All forms are cumulative and can contribute to the body burden. The goal of this preferred procedure is to minimize any additional exposure of the patient, ourselves, or staff to mercury
Against Amalgam As Hippocrates said, "First and foremost do no harm". I don't think he would have approved either toxic fillings or drilling away the good tooth.