fuhrmanator

Any idea why 1.74 high-index plastic lenses are harder to buy in Canada (Costco Canada stopped selling them a few years ago and only provide 1.67)? I have -8.0 correction with no astigmatism and am willing to pay for the best lenses. Why would a lab just stop providing that quality lens? Is it harder to work with? Require specialized machinery? etc?

My anxiety is not with my own teeth, but now with my kids (1.5 and 4). Should I really be flossing a kid's teeth when I can barely get my fingers into his mouth? Is a cleaning (because of tartar on the inside of the bottom front teeth) that important at age 4?