Diary - Last night, I watched a TV show where a speaker shared his toothbrushing routine.

[Maybo]

This is an entry from my diary. Please check it and correct any mistakes.

Last night, I watched a TV show where a speaker shared his toothbrushing routine. He said that many people would use water to rinse their month after spitting the toothpaste out but it wasn't necessary. He explained that if we rinse our mouth, we will lose protection of fluoride. It was my first time hearing about that theory. I then google to see if it was true. I was surprised that many resources confirmed the theory. However, I will still rinse my mouth because I've accustomed to it.

 

[Tarheel]

**Many people use water to rinse their mouth after brushing, but it's not necessary.

**It was my first time hearing that

**googled

**many sources

However I still wish my mouth because I've become accustomed to it.

 

[emsr2d2]

Last night, I watched a TV show where in which a speaker shared his toothbrushing routine. He said that many people would use water to rinse their month after spitting the toothpaste out but it wasn't isn't necessary. He explained that if we rinse our mouth with water, we will lose the protection of the fluoride. It was my the first time hearing I had heard about that theory. I then Googled it to see if it was true. I was surprised to find that many resources sources confirmed the theory. However, I will I'm still going to rinse my mouth with water because I've become accustomed to it.

See above. It would be much more natural to end with "because I'm used to it".
(His theory doesn't hold water (pardon the pun) for the many people who choose to use toothpaste that doesn't contain fluoride.)

 

[Maybo]

It was my the first time hearing I had heard about that theory.

If I use "hearing", do I need to use it with "this"? "This was my first time hearing ..."

Do they mean the same thing?:
1. "It was the first time I'd heard..."
2. "This was my first time hearing..."

 

[Tarheel]

Yes. You can also say, "It was the first time I'd heard about that."

 

[emsr2d2]

If I use "hearing", do I need to use it with "this"? "This was my first time hearing ..."

Do they mean the same thing?:
1. "It was the first time I'd heard..."
2. "This was my first time hearing..."

BrE doesn't use "This was my first time hearing ...".

This the first time I've heard ...
That was the first time I'd heard ...

 

[Maybo]

the protection of the fluoride

You use "the" for fluoride. Is it because you want to specify the fluoride in our mouth after brushing?

 

[emsr2d2]

You use "the" for fluoride. Is it because you want to specify the fluoride in our mouth after brushing?

No, it's because it's specifying the fluoride that's been added to the toothpaste.