It is absolutely safe to get your teeth aligned. There are various options for alignment, starting from metal braces, ceramic braces, invisible or clear aligners and lingual aligners as well. You'll need to wear retainers at the end of the alignment completion to maintain the teeth in their new place.
Coming to whitening, bleaching is a safe option. However start first by getting a dental scaling and polishing done. After that if you feel you want them to be more white, you can discuss with your dentist and plan for a professional whitening treatment.
Next Steps
visit a dentist for further assessment
Health Tips
always brush your teeth twice a day, floss once a day.