Adya Clarity treated water will not negatively affect fillings, amalgams, pacemakers, or other dental/medical/metal implants. People who have fillings/ heavy metals may experience grey streaks in their teeth. This is the metals precipitating out. Some people reported having black coloured finger tips, lips, or even a taste like they have had copper pennies in their mouth. This is not very common unless you are extremely heavy metal toxic. The grey streaks in the teeth will go away over a short time. As long as you properly dilute and use Adya Clarity, you will be fine.