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If I don't use mouth wash I end up getting ulcers all over my mouth. It's strange, not sure why but my mouth can't handle living without it.

You're not rinsing your mouth out after brushing are you?

For most spitting but not rinsing is as good as mouth wash.

Surely rinsing out the debris dislodged during the brushing process is preferrable to letting it remain in the mouth.

No, the current day advice really is to let whatever toothpaste is in your mouth after spitting just stay there.

It's just my mouth not being able to handle even the good bacteria. My genes are weak.