Which is better: rinsing after brushing teeth or just spitting and letting the paste stay on the teeth?
If you brush your mouth after brushing your teeth, you should stop doing so immediately.
Toothpaste works to protect your teeth from cavities, because it contains fluoride, which helps prevent tooth decay, and restore minerals that the tooth may lose as a result of the acids produced by the bacteria that cause decay.
Strengthening of tooth enamel
Toothpastes that contain fluoride and other ingredients intended to strengthen the enamel of your teeth may need to stay some time on the surface of your teeth in order to get the full benefit.
Fluoride helps your teeth most when it is applied directly to the teeth, and fluoride that stays on your teeth for several minutes longer provides more benefit.
So when you rinse your teeth with water immediately after brushing, you reduce the beneficial effect of fluoride.
Some experts, including Oral Health UK, recommend spitting out any excess toothpaste or saliva after brushing rather than rinsing with water.
Avoid eating or drinking for 10 minutes
Leave the paste on your teeth, and try to avoid eating or drinking for 10 minutes or more after you finish brushing, for adults.
As for children, it is recommended to put a smear of toothpaste for those younger than 3 years, and a pea-sized amount of paste for children between the ages of 3 and 6 years, then brush the teeth, then spit out the paste and then rinse the mouth with water, in order to reduce the risk of "fluorosis". Teeth, a condition that occurs if a child takes in too much fluoride.
So, help your teeth and keep them soft with fluoride for as long as possible.