In response to: “One year ago I let a dentist put 4 dental ceramic veneers. I’m starting to worry about it since I read some articles on this site. Ceramic is made from aluminum which is toxic. Also he used a composite to stick the veneers to my teeth. Should I let them removed? Thanks!”
Much to be said on this topic in dentistry, but to help answer this specific question, I wanted to set your concerns to rest concerning the veneers: Aluminum in Fillings and Crowns:Clifford.
The cementing/bonding agent is another story, but these are all problematic at this time. You can learn more in Mouth Matters: How your Mouth Ages Your Body and What You Can do About It.