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Steven Tyler is opening up about a recent bathroom fall during his South American tour with Aerosmith ... which resulted in Tyler getting two teeth knocked out.

The 63-year-old lead singer joked with Today's Matt Lauer:

    "I passed out, I felt nauseous. You can't handle the tooth!"

As for the fall in his Paraguay hotel shower, Tyler says he "got nauseous (from food poisoning), started to get sick and I fell on my face and I just passed out."

Many speculated that the rocker may have fallen off the wagon yet again. Back in 2009, Tyler underwent three months of rehab for substance use. The singer tells Lauer, "That's not the issue."

After postponing their show earlier in the week due to the fall, Aerosmith played their concert on Wednesday night with Tyler sporting a new, white grin and a black eye.