 Water fluoridation has been replaced by other modes in many countries where water supplies are too decentralized for it to be a practical choice, or existing natural fluoride levels were already ample, including Germany, Finland, Japan, Netherlands, Sweden, Switzerland, Denmark and at a time Israel.Cessation of water fluoridation has been demonstrated in scientific studies such as a recent one in Calgary, Alberta, to result in increased rates of dental decay.While fluoridation can result in mild dental fluorosis, this effect is barely detectable and causes no concerns with the appearance or health of teeth.