Does rinsing mouth with water after you eat work to prevent gum disease?

Studies show that the root cause of tooth loss is periodontal gum disease,bleeding gums, yellow teeth, Tooth Decay, Sensitive Teeth, bad breath which means the decaying of the gums. 15-20% of Americans suffer from it. This disease is very common in people over 50 globally

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Yes it helps to rid the mouth of food stuffs that can cause plaque acids. Rinsing with mouthwash would be even better. Chewing gum at least 30 to 40 mins after food can help as well because it produces saliva that helps to neutralise plaque acids.

It's more effective at reducing the acid in foods on your teeth.  (Acid is VERY bad for the enamel.)  But it also does help rid the mouth of bits of food that may have lodged there.

Yes, rinsing with water after eating can remove food, dissolve sugar, and neutralize acid in the mouth.  During times when it's not possible to brush and floss your teeth, rinsing with water is the next best option.

Maybe? My mom is a dentist and she doesn't say that..

She says brush morning and before bed. 

My work is sugarless, so I can eat as much as I want.

Rinsing with warm salt water is much better. 

It won't prevent it 100% but it can't hurt (and will help a little bit).