Yes that horizontally placed tooth can damage the adjacent tooth and gums. It's better to get it extacted.
Next Steps
Visit an oral surgeon for extraction
Health Tips
Extraction will take approximately half an hour under local anesthesia. You will under medicine cover for 3 to 5 days . you can do all your regular work from same day itself. Only there will be restrictions for certain foods and limited mouth opening. Within a week u will feel completely normal at that wound area.