I rinse my mouth with clean water after each meal of fruit. All fruits have acids, and the mouth likes being alkaline, so a little swish and whirl between the teeth then swallow is all I do.
Oh of course I always rinse after every meal, but I didn't always rinse in the beginning and to kind of make up for it I've been rinsing and brushing after every meal. I'm just not so sure if I might be hurting my teeth by brushing after eating sub-acid fruit like apples.
If in doubt - it's best to rinse and wait 20-30 minutes before brushing.
Another good method for cleaning the acids off the teeth is chewing on plain greens.
Various varieties of baby greens work really well.
I could eat my greens after my apples although I eat a good bit of apples and am usually pretty stuffed after eating a few pounds.
Chomping on a piece of celery or chewing on a couple of leafs does not usually add much and if you can not eat anymore just spit it out, though usually there is always room for a little bit of greens after :)
I would not brush...too harsh so many times a day. The teeth are such live body parts, why scour them. the plant roughage does the toughening.
I used to do a finger rinse ... gently washing the teeth surfaces with my fingers, over the sink with running water from my water filter. Too much trouble, but it felt good, and clean, for sure.
Yeah you are probably right.