Align Technology (ALGN) closed the most recent trading day at $252.33, moving +1.91% from the previous trading session. This change outpaced the S&P 500's 0.5% gain on the day. Elsewhere, the Dow gained 0.54%, while the tech-heavy Nasdaq added 0.76%.Coming into today, shares of the maker of the Invisalign tooth-straightening system had lost 1.26% in the past month. In that same time, the Medical sector gained 2.18%, while the S&P 500 gained 2.53%.Investors will be hoping for strength from ALGN as it approaches its next earnings release. In that report, analysts expect ALGN to post earnings of $0.83 per share. This would mark a year-over-year decline of 29.06%. Meanwhile, the Zacks Consensus Estimate for revenue is projecting net sales of $530.19 million, up 21.35% from the year-ago period.Looking at the full year, our Zacks Consensus Estimates suggest analysts are expecting earnings of $5.08 per share and revenue of $2.43 billion. These totals would mark changes of +3.25% and +23.72%, respectively, from last year.Any recent changes to analyst estimates for ALGN should also be noted by investors. These revisions help to show the ever-changing nature of near-term business trends. As such, positive estimate revisions reflect analyst optimism about the company's business and profitability.Our research shows that these estimate changes are directly correlated with near-term stock prices. We developed the Zacks Rank to capitalize on this phenomenon. Our system takes these estimate changes into account and delivers a clear, actionable rating model.Ranging from #1 (Strong Buy) to #5 (Strong Sell), the Zacks Rank system has a proven, outside-audited track record of outperformance, with #1 stocks returning an average of +25% annually since 1988. Over the past month, the Zacks Consensus EPS estimate has moved 1.34% higher. ALGN is currently a Zacks Rank #3 (Hold).Digging into valuation, ALGN currently has a Forward P/E ratio of 48.72. This represents a premium compared to its industry's average Forward P/E of 21.49.Also, we should mention that ALGN has a PEG ratio of 2.26. This popular metric is similar to the widely-known P/E ratio, with the difference being that the PEG ratio also takes into account the company's expected earnings growth rate. The Medical - Dental Supplies was holding an average PEG ratio of 2.23 at yesterday's closing price.The Medical - Dental Supplies industry is part of the Medical sector. This industry currently has a Zacks Industry Rank of 64, which puts it in the top 26% of all 250+ industries.The Zacks Industry Rank gauges the strength of our industry groups by measuring the average Zacks Rank of the individual stocks within the groups. Our research shows that the top 50% rated industries outperform the bottom half by a factor of 2 to 1.Be sure to follow all of these stock-moving metrics, and many more, on Zacks.com.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Align Technology, Inc. (ALGN): Free Stock Analysis Report To read this article on Zacks.com click here.