Sometimes it is worth it to buy shares of companies on the dip, and sometimes it isn't. It all depends on whether there are good reasons to believe the company in question will bounce back, and if it will, there is arguably no better time to invest than when it is down.Thankfully, even in a bull market like the one we're experiencing, you can find beaten-down but otherwise exciting stocks to buy. However, other market laggards are better left alone. Let's consider one stock in each category: Teladoc Health ...