My lower front teeth is aching for the last 3 days now. It happens hours after eating sweets and they are splitting. Should I go to a dental clinic?

Absolutely yes. It is very likely that you have cavities that are deep enough to cause the aching. If you eat a lot of sweets then it would be wise to give them up completely, brush 2 or 3 times a day and see a dentist to check your teeth for cavities. And don't forget to floss once a day.