I had an tooth infection after wisdom teeth removal. since then i brushed my teeth every time i ate something.. probably 5-8times a day for a month.my teeth feel sensitive now. i also use salt water to rinse. did i damage the enamel permanently?

You have been overdoing it, so back off. You need to brush and floss well at least once in a 24 hr period preferably before retiring at night. Doi not brush immediately after meals it will harm your teeth. Please read my article: https://smallbusinesstrendsetters.com/beverly-hills-dentist-dr-neil-mcleod-says-to-preserve-tooth-enamel-dont-rush-to-brush/

Excessive brushing may cause tooth abrasion and resulting sensitivity. But usually this takes months and years a month can either precipitate symptoms from previous similar habits or you already had recession and it could just be coincidental. A good clinical evaluation is recommended especially a periodontist to determine if your suspicion is correct. Salt water rinses may not help with sensitivi

Forget the salt water. Cut brushing back to 2x/day w soft t'brush for 2 full minutes by the clock, and flossing or using WaterPik 1x/day. Sensitivity may be from over brushing causing gum recession and root exposure. Pleases Dentist/Hygienist for an effective safe oral hygiene regimen.