Broken retainer after 12 years. Can my teeth start moving?

Yes, if made correctly and worn as instructed by your orthodontist, retainers will prevent your teeth from further shifting.  Remember, retainers are for "retaining", and not necessarily for "moving" teeth.  They should do a good job keeping them in their current position, but if you...

You appear to have a deep overbite which is the result of a narrow upper jaw.  This can be from the narrow upper jaw 'trapping' the lower jaw into a recessed position.  Your upper jaw can be orthopedically expanded to match the lower jaw width.  Work with an orthodontist/dentist...

I highly recommend you go and see a dentist and have a full mouth x-ray taken. This will determine where the teeth either side of your two front teeth (where the gaps are) are positioned. These teeth are called lateral incisors and they should have come through by this age. So it might be that...

BEFORE extracting any teeth, or putting any braces on your teeth ask your orthodontist what the effects of extracting teeth will have on facial aesthetics, airway health and TMJ health. If he/she does not have very concise answers that make sense DO NOT extract any teeth and do NOT have braces...

I am unsure why you have pressure in your ears due to the limited history you presented. Are you wearing a night guard because of a TMJ (jaw joint issue) or because you grind your teeth at night? Based on your photos, you don't need to have teeth removed...I would get a second opinion

Likely, but more importantly; you'll need to see an orthodontist that knows what he is doing.   With Invisalign, as with braces, it makes a difference WHO is working it.  So, forget all these Google ads for cheap treatment, you could get into big trouble, and find a reputable...