Is an inch of toothpaste okay to swallow?

I was brushing my teeth a little while ago an i put around an inch, maybe an inch and a half of toothpaste on the brush. Usually after you're done brushing, you spit and you see most of it come back out. I didn't see around an inch come out, I only saw a little and saliva. So I may have swallowed some, I'm not 100% sure. But I was just wondering if it's only harmful if you swallow a massive amount like an entire tube or even half the tube?