Sometimes there is numbness
of teeth if the teeth have been abraded due to bruxism
or acidity leading to dissolution of enamel from the tooth and mild chronic irritation to dentinal tubules and nerves. Please notice if you gym more, with heavy weights leading to clenching or are stressed as they are the factors leading to the same. I know you have ruled out bruxism but many a times it is night bruxism which you may not notice while sleeping and as is involuntary you may not even notice during daily activities such as driving, cooking , picking heavy weights etc. I would recommend you to visit a dentist
to rule it out and to see clinically if anything else is the cause.