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Presuming you have not limited edge port 22 to one or two IPS and that you are not translating a high port to 22 internal, the danger is that you are allowing the entire internet to hammer away at your ssh. If you have this described setup, you will most definitely see the evidence of attempts to break in in your SSH endpoint and firewall logs.
Zero days for SSH do exist, so it's just a matter of time before you're compromised if you leave this open.
Imagine opening all the windows in your flat. Then leaving them open for a month. What would happen? How many insects would make their new home in your home? How many critters and cats would do the same?
Now, each window is a port. Your flat is your network. Each critter or cat is a bad actor. Each insect is a bot or virus.