Appearance of newly erupted permanent teeth edges is absolutely normal and those will flatten with time. Get lower front teeth( primary central/lateral incisors) extracted which are preventing those newly erupted teeth to fall into the alignment. If delayed it may not fall back into the alignment.

This is absolutely normal and wear off as they are being used. U can see them on the newly grown upper teeth as well.

This is normal .in erupting teeths..dont worry

That is perfect opinion given by the other doctor earlier. The shark like or ups and downs on the teeth are called mameleons and they go off as age increases or as the teeth totally come up. No need to worry. But schedule an appointment with your doctor as the teeth are coming inside(Lingually placed) so that you will get expertise opinion too

These are not shark teeth but the mammelons present on the newly erupted teeth which will go away with increasing use and age! Please dont worry and schedule your appointment with a dentist.