Years ago, dental amalgams made of silver, copper, tin and mercury were used for just about all dental fillings. Over the years, mercury became questionable, but by mixing it with other metals the mercury is still deemed safe to use for fillings.
However, of the past several years, tooth colored composite fillings have become more popular. They are made of a mixture of quartz fillers and glass that is made to match the color of your natural teeth. Most people prefer to have this type of filling simply because they are not as visible as the old-fashioned silver fillings can be.
If you have a tooth that has had damage, like cracks or chips, the procedure to strengthen those teeth would be a dental crown. Covering the damaged tooth with a porcelain material will serve to strengthen the existing tooth so it can be saved from extraction. At the same time, a dental crown can be placed on an implanted tooth to give you the appearance that is the same as your natural teeth.
When the nerve portion of your tooth becomes decayed or infected, pain sets in that is like none you've ever experienced in your mouth. Eating or drinking hot or cold foods becomes extremely painful. A root canal therapy is done to remove the infection from that inner layer of your tooth, so that it can be replaced with a material that cannot become infected.