Just about everything erodes tooth enamel, with sugar and starches being the worst. Brushing hard or not using a soft brush tears up the gums. The bristles on hard brushes can’t spread out to cover between teeth and hidden aread and sweep away bacteria.

No, if you use a soft toothbrush, the tooth enamel willl grow back. Link

Enamel is not made of living cells, therefore it cannot regrow.

Scientists from China have invented a gel that contains mineral clusters naturally found in teeth. In partially acid-damaged teeth, the gel stimulates crystal regrowth to restore tooth enamel back to its original structure.

While the method is yet to be tested on people, one day this could mean saying goodbye to painful needles, the dreaded dentist drill, and even fillings.

Not brushing is worse on your enamel than brushing.