Jacqueline Mong, Singapore

The main cause of myopia, especially in children, is believed to be a combination of genetic predisposition and environmental factors. If parents are myopic, their children are more likely to develop myopia as well. However, environmental factors such as excessive near work (such as prolonged reading or screen time), limited outdoor activities, and inadequate lighting may also contribute to the development and progression of myopia in children. These factors can lead to the elongation of the eyeball, resulting in light focusing in front of the retina instead of directly on it, which causes blurred distance vision characteristic of myopia. https://www.basictrailers.com.au/

This link might help too:http://www.makingmontessoriours.com/2011/09/complete-list-of-montessori-materials.html

Here is another article you can look at for suggestions on how to prevent the stains: http://sg.theasianparent.com/when-your-childs-smile-is-less-than-brilliant/ The main thing being practicing good oral hygiene from young. Teaching them how to brush their teeth properly and using appropriate toothpaste for babies and toddlers. Regular visits to the dentist will be good as well. Some preventive measures for tooth discolouration mentioned in the article include: - Keeping sugar from all sources to a minimum - Limiting the amount of foods your child eats that contain dyes - Limiting the abrasives your child puts into their mouth. These include excessive salt and acidic foods and juices