I quote the opinion of the dentist from the article (link below).
"Teeth should be brushed after eating: the point of brushing is to remove food that has gotten into the teeth gaps after you eat. I understand those who brush their teeth before eating: they don't like this taste in their mouth after sleep.But what will a brush give? In the morning, your teeth are already clean, you don't eat at night, so nothing sticks to them during the night. This unpleasant taste in your mouth appears from - due to the multiplication of bacteria inside the gums and their secretion of waste products. What can you do? You can use foam or mouthwash to wash off this taste in your mouth. There is no point in brushing your teeth before breakfast: there is no food between your teeth. "
How many toothpastes and toothbrushes a healthy person should have, why brush his tongue, and - finally! - we will find out who is right: the one who brushes his teeth before breakfast, or the one who after
Ideally, both then and then. In theory, teeth should be brushed every time you eat to remove food debris and prevent bacteria from growing in your mouth. In the morning, there are a lot of bacteria in your oral cavity, from which you brush your teeth in the morning.